LATE MODEL DIVISION RULES
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PREFACE
The rules in this book are intended to make
racing less expensive and keep competition as equal as possible. While these
rules offer a good outline, every item cannot be covered by a written rule. If
you come up with something not covered in the rules, PLEASE ASK FIRST!
All rules in the NASCAR Rulebook will be
enforced with the following changes and additions. These rules are for Stafford
Motor Speedway only with no expressed or implied agreement with any other
speedway as to the interpretation, implementation and method of inspection by
the technical inspectors and officials.
No equipment will be considered as having been
approved by reason of having previously passed through inspection unobserved.
No car will be considered as having passed inspection for the event until
the finish is made official.
DEFINITION OF
STOCK: In
the following Rules you will see the term OEM Stock used. This means Original
Equipment Manufacturer. The parts must come on a standard production car.
Special "Off-Road" or racing parts will not be permitted unless preapproved.
No carbon fiber or titanium engine, chassis or body parts unless approved by
track officials.
ILLEGAL ITEMS - Absolutely NO removal of,
alteration of, or covering of casting numbers, part numbers, manufacturers
name, logo, insignia, etc., from any item on the race car. To do so makes a
part illegal and will be treated as such. If you come up with a rare part that
we cannot find listed for passenger car use, the burden of proof is on
you. At any time you may be asked to
remove a head, manifold or possibly an entire engine for inspection. Failure to
comply will result in the same penalty as if it were illegal.
INSPECTION - All model, engine or equipment changes or
modifications not specifically addressed in this rulebook must be submitted to
Stafford Speedway for consideration of approval. All equipment is subject to
the approval of Track Officials. Equipment will not be considered as having
been approved by reason of having passed through inspection unobserved. Any
equipment that does not conform to specifications or tolerances contained in
this rulebook or is not otherwise approved by Stafford Speedway may not be used
in competition.
POST RACE INSPECTION. Once a
car has been presented to Stafford Technical Inspectors for post race
inspection the entire car and all its parts become subject to inspection. This
includes but is not limited to items designated for inspection following a
particular event.
SCALES. For purpose of post
race inspection drivers must seated in their cars in a racing position with
helmet either on or placed in their lap. No leaning or hanging on bars is
permitted. The driver must remain in his/her car until it is removed from the
scale area.
ABSOLUTLY NO SOMKING ALLOWED
IN THE FENCED IN TECH AREA
The rules in this book may be added to,
deleted from or changed at any time with the only notice to be given at the
event drivers meeting or via technical bulletin. All officials’ decisions are
final, non-appealable and non-litigable. Technical bulletins will be issued as
needed.
UPDATES - All changes and updates
made during the course of the season for the current rulebook will be posted to
the Stafford Motor Speedway website. This will serve as the only form of
official notification until the printing of next Stafford Motor Speedway
rulebook.
STAFFORD
SPEEDWAY TRACK RULES
NOTICE
Alcohol will not be permitted in the Stafford Speedway pit or paddock areas at
any time. The consumption of alcohol before, during or after a race event in
the pit or paddock areas is prohibited
SECTION 1-4
All NASCAR Rules will be enforced with the exception of the following
STAFFORD SPEEDWAY TRACK RULES. These rules supersede any similar NASCAR Rules and are in effect for all
auto racing events unless otherwise posted and/or announced prior to the event.
NOTE: Some Track Rules may not apply to touring
divisions.
SECTION 6
SAFETY
Stock car racing
is an inherently dangerous sport. Each Competitor assumes that risk when he or
she participates in an Event. The risk of serious injury or death cannot be eliminated
and in fact will always be present at a high level. Members are required to
advise their spouses and next of kin, if any, of this fact. Although safety is
generally everyone’s concern, Stafford Motor Speedway cannot be, and is not
responsible for all or even most aspects of the safety effort. That
responsibility instead rests with the various participants in the Event(s) as
follows.
All competitors
are obligated to inspect the racing facilities, safety personnel and equipment,
and conditions at the track on a continuing basis, before, during and after the
event. Competitors must report to Stafford Motor Speedway management promptly
any inadequacy in the facilities, personnel, equipment or conditions at the
track.
PASSENGERS are not permitted in or on a racecar at any
time. No one shall ride with any part of his or her body outside the racecar.
No riding on trailers or car haulers or pit carts anywhere on the
speedway property.
NEITHER STAFFORD MOTOR
SPEEDWAY NOR TRACK OFFICIALS CAN OR WILL BE RESPONSIBLE FOR THE ADEQUACY OF A
COMPETITOR’S RACECAR, RACING EQUIPMENT OR RACING ACTIVITY TO ACCOMPLISH THIS
PURPOSE.
SECTION 9
RACE PROCEDURE
1. All cars must go
into the infield before turning into the off-track paddock gate except at the
conclusion of the feature event. No right turn from the track to the paddock.
All cars must go through the infield road after each warm-up session and
qualifying event. After feature events cars may go directly into the paddock
area without going through the infield. The first three (3) cars in the feature
finish must report to victory lane. DO
NOT DO BURNOUTS OR DONUTS ANYWHERE ON THE RACE TRACK OR INFIELD AFTER THE
FEATURE EVENT OR AT ANY OTHER TIME.
2. The track crew, officials, wrecker or push truck drivers are not
allowed to work on race cars on the track, infield, pit or paddock areas.
3.
No car will be permitted to pass the caution vehicle unless instructed to
do so by NASCAR Officials.
4.
No car will be permitted on the track at any time without a hood.
5. All owners of cars that the oil pan cannot be removed with the
engine in the chassis must have a carb flange lift plate or other device for
the removal of the engine.
6.
At no time shall a car be jacked up without jack stands with pads being placed
under it except for normal tire changes during the race event. At no time shall a person be permitted to go
under a car without jackstands. This rule applies to both the infield pit and
paddock areas.
SECTION
9.5 HANDICAPPING Note: Some rules
do not apply to DARE STOCK Division.
All drivers must
complete a Number Application form before signing in.
For all events your car must be signed
in 45 MINUTES before the first heat race is scheduled. Once the line-ups are
posted no additional cars may be added.
If your car is signed in but does not arrive you may be credited with
two wins for handicap purposes.
When you sign in
your car state your division, assigned car number
and the driver’s name. If you bring two cars, one as a BACK-UP CAR
you must decide and indicate which car will be your primary car when you sign
in. Drivers will be handicapped on a 3-week money won system. For handicapping
purposes regular feature event purses will be used. Any driver that misses
an event will be credited with a regular feature win in money plus 1/2 feature
win in money for handicapping purposes. Any driver disqualified from a feature event will be credited with a regular
feature win plus 1/2-feature win in money for handicapping purposes. The top 18 drivers in points will be handicapped ahead of drivers not in the top
18 for the main feature only.
No current
season feature-winning driver may be posted to start higher than fifth
position in a feature event.
Note: For some events the top ten cars in
points may be considered as pre-qualified. The car must still be signed in 45
minutes before racing starts to take advantage of being pre-qualified.
All alternate feature cars will be taken
from the consolation event. If a car is disqualified from a heat additional
cars will not be taken from heats but from the consolation or ‘B’ feature.
If in the
opinion of the Racing
Director a car is not competitive on a given night, he has the authority
to deny that driver a front starting position.
For additional
handicapping information please ask handicapper for clarification.
PAST CHAMPION’S PROVISIONAL POSITION
One additional starting positions have been established which will be available to the most recent Stafford Motor Speedway Champion who has not qualified for the starting field. If a former Stafford Motor Speedway champion is not assigned this starting position, it will then be assigned to the next eligible driver who did not qualify for one of the original starting positions based on the current Stafford Motor Speedway championship point standings.
PROVISIONAL POSITIONS
Two additional starting
positions have been established which will be available to the highest drivers
in the current Stafford Motor Speedway Championship Point Standings who have
not qualified for the starting field.
ROOKIE RULES
A. Rookie Rules apply to SK
Modified®, SK Light Modified, Late Model, and Limited Late Models divisions. To
be considered as a rookie you must not have competed in more than five, (5) feature
events in this or a higher division at Stafford Motor Speedway.
B. All cars driven by rookies
must have a yellow stripe on the rear bumper. Rookies may not have another driver qualify a car for them.
C. The current Rookie of the
Year as determined from the previous season, will be awarded $100 each event
starting with the first event of the current calendar year and continuing each
consecutive event until the total award amount for each division is
distributed. To be eligible for the Rookie of the Year award the driver must
attempt to qualify. If the current Rookie of the Year as determined from the
previous season is not eligible for this award, the award will then be available
to the next highest finishing eligible rookie driver in the previous season
Rookie of the Year points standings.
SECTION 9.6 STARTING LINE-UP & RESTARTS
If a car(s) drops out of the posted starting
line-up, all cars in that row will move straight up to fill the spots in all
events. No crossing over. If a restart occurs with ten, (10) laps or less to the end of the
feature, all lapped cars will be removed from and started behind the lead lap
cars in the restart line up.
SECTION 10.4
YELLOW & RED FLAG/LIGHT RULE
SECTION 10.8 CHECKERED FLAG - RACE END
All FEATURE
races will end with a GREEN, WHITE,
CHECKERED unless in the opinion of the officials the track is no longer
safe for racing.
SECTION 11.1 OFFICIAL SCORING
SK Modifieds®, Late Models, SK Light Modified and
Limited Late Models must have a scoring transponder assigned and
attached to the racecar for practice or racing. (Please see installation
specifications on page 7). All competitors will have 15 minutes after their
feature event is announced and posted to file an inquiry. Once the inquiry is
satisfied the official finish will be posted. No changes will be made once the
finish is official. Transponders are required to be on the car and
working for all race events
including practice sessions.
FOR
SALE SIGNS
For Sale Signs are not permitted on cars in feature events.
BACK-UP CARS – Separate number registration is
required for back-up cars. No cars competing in the same
division will be allowed in the paddock area with the same number.
INFIELD PITTING
1.
Infield pitting will be used for all SK Modified and Late Model
features. All crewmembers that
go to the infield pit area will be required to have a NASCAR license.
During race
conditions, any crewmember who steps into the car servicing area must wear a
helmet All people on the infield must wear long pants with a minimum short
sleeve shirt and closed toe footwear at all times. You must pit in your proper
pit stall.
2.
NASCAR pit rules will apply including the amount of
crewmembers over the wall, etc. A stop & go official will be at the exit of
pit road only. You may not enter pit lane until the pace car picks up the
leaders and the pit road is opened. You may pull up to but not pass the pace
car.
3.
No
crewmember may go into the pit box until the car has come to a complete stop.
4. Pit stalls will correspond to the starting positions of the
feature line up.
5. The speed limit on pit road at all times including
qualifying and practice will be 25 MPH.
Speeding in the pits may result in
disqualification.
6. Absolutely no fueling of cars on the infield. No gasoline containers will be
permitted on the infield.
7. Wreckers and push trucks are not permitted to bring pit
materials to the infield to set up your pit stalls.
8. All
cars out of the event must go behind the wall on the infield.
6- 4 PERSONAL SAFETY EQUIPMENT
See NASCAR WEEKLY SERIES
RULE BOOK
6- 4-1 HELMETS- HEAD AND NECK RESTRAINT DEVICES
See NASCAR WEEKLY SERIES
RULE BOOK
6- 4-2 SEAT BELTS
See NASCAR WEEKLY SERIES
RULE BOOK
6- 4-3 SEATS
See NASCAR WEEKLY SERIES
RULE BOOK
SCORING
TRANSPONDER LOCATION
Transponder mounting brackets will be installed on the inside (or outside) of the right rear frame rail. The round post of the bracket must be on top and the square tab on the bottom flush with the lower edge of the frame rail. The bracket must be mounted with it’s center line exactly 12” to the rear of the rear axle centerline and must be completely vertical to the ground. Keep exhaust directed away from transponder.
Transponders are available from
AMB, US, Inc
32 Highlands Parkway, Suite 104
Smyrna, GA 30082
Tel 678-816-4000 Fax 678-816-4001
AMB, US, Inc
www.amb-it.com
1-678-816-4000
Master Frequency List 1-207-571-9165
Racing Electronics:
www.racingelectronics.com
1-800-272-7111
Hoosier
Tire East
1-860-646-9646
Dave
Lind Racing
1-800-562-9527
Reliable Welding & Speed
www.reliableweldingandspeed.com 1-888-225-7223
New England Racing Fuel
www.newenglandracingfuel.com 1-860-673-9555
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Track Frequency Channel #1 SK Modified®, Late Model 464.50000
Track Frequency Channel #15 SK Light, Ltd. L.M., D.A.R.E. Stock 461.13750
LATE MODEL DIVISION
ALL 2008 NASCAR
WHELEN ALL AMERICAN SERIES RULES FOR THE LATE MODEL STOCK CAR DIVISION WILL
BE ENFORCED FOR THE
STAFFORD LATE MODELS WITH THE
FOLLOWING CHANGES AND ADDITIONS.
DRIVER ELIGIBILITY - All drivers must
have a NASCAR CHD (CHARGER DIVISION DRIVER) or higher license. Drivers competing
in the LATE MODEL division at Stafford Speedway will not be permitted in the
SK LIGHT MODIFIED, LIMITED LATE MODEL, or D.A.R.E. STOCK division on the same
event date.
20F- 1 COMPETING CHASSIS - American made chassis with a minimum of 108" wheelbase as factory listed for that year and model. No Firebirds, Camaros, Mustangs or two passenger sports cars. No convertibles, station wagons, or use of their frames for other models. Body may different from frame and engine but engine and frame parts must be from the same corporate line (i.e. GM, Ford, Chrysler). If you are in doubt about the eligibility of a make or model, CHECK BEFORE YOU BUILD IT!
20F- 2.1 BODIES – All bodies must be NASCAR approved. See NASCAR Rulebook Late Model Stock Car Division for approved bodies and additional body specifications. Original dimensions of all bodies must remain as manufactured except for changes which may be necessary for tire clearance. All aftermarket body and trim parts must be acceptable to Track Officials.
As of 2008 all Late Models will be subject to the
A-B-C body type measurements. Track
officials will use A-B-C type templates to insure the measurements from car
to car are the same. All measurements
from the NASCAR Rule Book and the A-B-C book are the same. Only the location
of the following two measurements nose height and rear overhang and the letters
of the measurements themselves are different. Tolerance will be built into
the templates from the manufactures. All vertical measurements from either
book will be plus one (1) inch. With the exception of the 18 ¼” min deck lid
length all other measurements that say minimum or maximum shall be considered
as exact for this division. Any other models must be approved by Stafford
Motor Speedway.
Older Late Models and Limited Late Models with higher
roof heights will be adjusted according to the rule. The A-B-C RULE BOOK will be made available to all 2008 competitors.
20F- 2.2 OVERALL CAR WEIGHT - All specified weight requirements will be with the driver. The minimum weight at all times will be 3000 pounds. No car will be allowed to have more than 55% of the total weight as the left side weight. All weight must be bolted to the inside of the frame rail and above the lowest edge of the frame where weight is mounted.
20F- 2.3 ADDED CAR WEIGHT - Added weight must be in block form of no less than five (5) pound blocks (no pellets) of magnetic steel or lead only. Added weight must be securely bolted to the frame rail and painted white with the car number stenciled in black. No added weight will be permitted inside the driver’s compartment. Weight must be welded in a box or attached with two or more grade ‘8’ bolts minimum 7/16 dia.
20F- 2.4 CAR WEIGHTS AFTER RACE - Nothing may be added to or taken from the car to make total or left side weight. Gas, oil or water may not be added. Wheels and tires cannot be changed, but an amount equal to one half of one percent (.5%) of the gross weight will be added for loss in weight due to race wear.
20F- 3 DETAILED BODY REQUIREMENTS – Steel aftermarket
replacement bodies may be used in place of stock. Hood and roof may be made
of fiberglass. Steel front fenders may be replaced with plastic. Fiberglass front
fenders are not permitted. Body
must be, straight and stock, mounted in the stock location on the frame. No
lowering, chopping, channeling or streamlining of any body parts or roof.
Stock window openings must be maintained.
No fiberglass replacement parts unless noted
elsewhere in the rules. All exterior chrome trim ornaments, outside mirrors
and door handles must be removed. Replacement body parts must meet NASCAR
templates. No body skirts or lower body rocker panel flares. Rolled under
rocker panels are recommended. Rear quarter panels may be plastic
or steel only
20F- 3.1.1 FRONT AIR DAM - Approved air dams must maintain 5” ground clearance.
20F- 3.1.2 REAR SPOILERS - A non-adjustable freestanding clear polycarbonate glass solid rear spoiler is permitted. Spoiler will be a maximum of 4" in height and a maximum of 48” in width. Spoiler must be placed in the center and at the rear edge of the trunk lid. No side gussets. All spoilers are subject to track approval.
20F- 3.2 GLASS - No side windows allowed. Full windshield is required made of clear glass or 1/8" polycarbonate glass. Windshield must maintain stock angle and fit template. Windshield must have two safety straps on the inside and out. No cracked windshields allowed. All lights and lenses must be removed from the car. Headlight and taillight openings must be covered. Headlamp and tail lamp decals are recommended for aesthetic reasons. No tinted side, quarter or rear windows.
20F- 3.2.2 REAR WINDOW - Full clear polycarbonate glass rear window is required. Two 1" straps are required inside and outside. Stock angle must be maintained. No tinted glass.
20F- 3.2.3 SIDE
WINDOW GLASS/WINDOW SCREEN – All door window glass must be removed. A nylon window screen must be installed
in the left side door window opening. And be positioned to cover the entire
window opening. The window screen must be rib type, made from minimum ¾ inch,
maximum one (1) inch wide nylon material with a minimum one (1) inch and a
maximum 2-1/4 inches square opening between the ribs. The minimum window screen
size must be must be 22 inches wide by 16 inches high. All window screen mounts
must be a minimum ½ inch diameter solid steel rod on the bottom and a minimum
one (1) inch wide by 3/16 inch thick flat steel or a minimum ½ inch diameter
solid steel rod on the top, with mounts welded to the roll cage. The window
screen, when in the closed position, must fit tight and be secured with a
lever-type quick release latch acceptable to Track Officials. The lever must
be secured by a detent ball in the lever and may be supplemented by Velcro®
fastener only – pins or clips will not be permitted. The latch must be mounted
at the top in the front to roof bar (#3) release from the inside.
20F- 3.2.5 REAR VIEW MIRROR - One (1) rear view mirror that must be mounted at the top of the windshield no larger than 8” X 2”. No multi-image or side mirrors. Oversized mirrors maybe blacked out by the use of paint only, to obtain the 8” X 2” maximum reflective area. Any size or type of spot mirror is not permitted in any location.
20F- 3.3 DASHBOARD - Stock unit may be removed but must be replaced with sheet steel, a minimum of 24-gage (0.025 inch thick), of similar design, and the full width of the body. Per NASCAR rulebook, all cars should have a removable inspection panel with a minimum size of 10” (ten) by 10”(ten) or 8” (eight) by 18” (eighteen) on top of the dash on the driver’s side for inspection of all wiring under the dash panel.
20F- 3.4 FIREWALLS
A. Front firewall must be in stock location and be made of minimum .031" metal with all holes covered using sheet metal a minimum of .031" thickness. Aluminum is not permitted. The front firewall must extend down to the top of the frame.
B. Rear firewall must be made of minimum .031" magnetic sheet metal securely installed over the rear seat back brace and top shelf or “hat rack”, completely closing off the trunk compartment.
C. The top shelf or “hat rack” must be positioned horizontal and approximately level. At a maximum of 30-iches from back to front, the top self or “hat rack” must angle downward approximately 30-degrees and continue downward attaching to the #6 bar or lower.
D. The stock floor pan may be replaced with minimum .031" magnetic sheet metal bent similar to the original configuration. Any part of the passenger side floor pan higher than the top of the frame rail is not permitted. The passenger side floor pan may come straight across from a maximum height of the top of the frame rail, to the transmission tunnel. The floor must be sealed to the bottom of the door on both sides of the car. The rear seat area must seal to the rear firewall.
E. The transmission tunnel shape may be altered however must remain in original center position (equal distance from frame rails to either side of the tunnel) and within 1-inch of original height. Additionally the transmission tunnel must remain within 2-inches of stock width.
F. Door bars may not be covered on the interior of the car and must be visible for inspection from the inside of the car.
G. Absolutely no closing in of passenger compartment next to or behind driver.
20F- 3.5 DOORS - Doors may be steel or aluminum External nerf bars may be used if no larger than 1” round tubing. Bars must be “skin” tight and painted the same as the body panel it is attached to. Bars must be at centerline of the front and rear tire. No bars behind rear wheels. Ends must be turned into and go through the body or bolted at the end of the bar with a flush bolt that goes trough the body to an interior bar of the same length as the outside bar to prevent hooking. The outside bar must have the ends rounded. No spreading or narrowing of body. Replacement doors must have stock contour. No slab sided cars.
20F- 3.6 FENDERS Front fenders and rear quarter panels may be
either steel or plastic.
20F- 3.7 GRILLES - Grill openings must remain stock for body run.
20F- 3.8 HOODS, ROOF
A. Hoods may be made of steel, aluminum or fiberglass. The hood and scoop must seal tight to the fenders and windshield. Hood must be in place at all times
B. Hood must be held closed with quick release pins. Hinged hoods are permitted.
C. No holes or functioning air scoops allowed. Hoods must lay flat.
D. No openings for air to the carburetor or breather are permitted.
E. All roofs must be the same size and shape of a production roof. Steel or fiberglass roof permitted. Roof panels must be permanently mounted in the stock position the same as a stock production roof for the make and model car being used.
20F- 3.9 REAR DECK LIDS/TRUNKS - The rear deck lid / trunk may be steel or aluminum. Fiberglass is not allowed in these areas. The rear deck lid must maintain the same dimensions, angles and bodylines as the stock production car. Lid may be held closed with quick release pins. Complete taillight panel and bumper covers must be run. No flat back cars. Taillight decals are recommended.
20F- 3.10 BUMPERS/BUMPER COVERS – The bumpers/bumper covers must be acceptable to Track Officials and meet the following requirement:
A. The front and rear bumpers and/or bumper covers must be installed in the same location as far as height, width and depth as a stock factory production bumper.
B. Magnetic steel tubing must
be used to reinforce the front and rear bumper covers. The tubing must not
be exposed and must remain behind the bumper covers.
C. The front and rear bumpers/bumper
covers must be solid. Holes will not be permitted .
D. All front and rear bumper
covers must be painted the same color as the car including bolts and rivets
20F- 3.11 IDENTIFICATION
– See NASCAR Rule Book. Roof numbers
must read from passenger’s side of car. Stafford Motor Speedway reserves the
right to assign number colors. Numbers must be present and visible
for all events including practice sessions.
20F- 3.12.1 BODY TEMPLATES - Templates may be used to check any cars, which have questionable, body dimensions or configuration. Decision of Track Officials is final.
20F- 4 GENERAL ENGINE REQUIREMENTS
- Engine must be OEM cast iron V8 production block, heads and intake manifold.
The ONLY approved engine for GM is the CHEVROLET 350,
FORD is the 351 CLEVELAND or WINDSOR, MOPAR is the 360. No de-flashing, grinding,
welding or painting of any internal area. Maximum overbore for Chevrolet and
Ford is .045". Maximum overbore for MOPAR is .030”. A max static compression ratio of
11.5 to 1 will be allowed on all engine models.
20F- 5 DETAILED ENGINE REQUIREMENTS
20F- 5.1 ENGINE LOCATION
A. Engine must be in the stock location for a V8 in the chassis being run. Stock engine location is deemed to be when the distance between centerlines of the forward most fuel pump to engine block mounting bolt and the upper idler-arm to frame mounting bolt measures 8.75” inches +/- .25” inch so long as said bolts are deemed to be in stock, un-altered, factory locations.
B. The front, centerline of the crankshaft must be no less than 12 3/4 inches from the ground with the car’s frame set on five (5”) inch high blocks under all four outer corners of the frame.
20F-
5.5 PISTONS/RODS
A. Any flat top three (3) ring round aluminum piston with three (3)
rings in place will be permitted. Valve
relief’s for valve clearance only may be cut into the pistons. All three rings
must be of magnetic steel. No portion of piston may protrude above the top
of the block. Effective for 2008 the minimum ring thickness permitted
is as follows:
Compression rings
.043 inch
Oil ring assembly 3.0
mm
B. Only magnetic steel piston pins maintaining a minimum diameter of 0927 inch
are permitted. Full floating pins are permitted.
C. Piston pin holes must be in a fixed
location in the piston and connecting rods.
D. Only two-piece insert style connecting
rod bearings are permitted.
E. Only solid magnetic steel stock type connecting rods are permitted. Hollow beam connecting rods are not permitted.
All after-market connecting rods must be steel sportsman rods. Only normal
engine balancing and the use of after-market bolts and nuts are permitted.
No de-burring, de-flashing, polishing, grinding or lightening. Billet connecting
rods are not permitted. All rods must maintain the minimum/maximum rod lengths
listed below:
MANUFACTURER MINIMUM
MAXIMUM
Dodge 6.000
6.250
Ford “Cleveland” 5.778
6.250
General Motors
5.700
6.250
All connecting rods of an engine must be the same length.
F. Titanium and stainless
steel connecting rods are not permitted
G. Minimum
weight for piston, pin, ring, bearing and rod assembly is 1075 grams.
20F- 5.5.4 OIL PAN - NO dry sumps, external oil pumps or tanks or accu-sump systems allowed. Windage trays of any type will be allowed. Oil coolers are allowed. Only OEM in the pan type oil pumps are permitted. No pumps of any type may be used in the evacuation system.
20F- 5.6 HEADS - OEM CAST IRON. The only CHEVROLET heads allowed will be the “492” castings or the “old style 461 or 462 type heads”. Angle plug, Bow-tie or Vortec heads are not permitted. Effective immediately, the DART head part number 10024266 is no longer permitted for use on the open Late Model motor. The DART head part number 10024266 can be used with the Late Model spec motor. Intake valve must be a maximum of 2.02". Exhaust valve must be no larger than 1.60". FORD CLEVELAND or WINDSOR must run heads of two barrel design that came on a passenger vehicle, with a maximum intake valve of 2.05 and exhaust valve of 1.66. FORD Motorsports heads are not permitted. The MOPAR permitted head is the passenger car version of casting number 3418915 with a maximum intake valve of 2.02 and exhaust valve of 1.60. W2 or TA heads are not permitted. IMPORTANT -All CHEVROLET and FORD heads must have a minimum of 60cc combustion chambers. MOPAR must have a minimum of 64cc combustion chambers. When heads are checked at the track you will be responsible for cleaning and carbon removal to make the respective cc limit. The only modifications ALLOWED will be the installation of valve guide sleeves and milling of the gasket surfaces, however angle milling, changing the angle of the head gasket surface in relationship to the rest of the head, is not permitted. Additionally altering the position or angle of the valve guide is not permitted. The addition of screw-in studs, guide plates, valve spring seats, optional valve seals, Poly-Locks or jam-nut devises are permitted. The only machining of valve guide bosses allowed is for seals only. Coolant return lines are allowed to be placed on the ends of the heads. No lines will be allowed on the sides of the head. Any other heads must be approved before being used. All other head modifications ARE NOT ALLOWED including but not limited to: Porting, polishing, ANY grinding in ports or combustion chambers, chemical milling, glass beading or removal of any flashing or casting marks. No welding or sectioning. No internal modifications of any kind including painting or Teflon coating. No more than two intake-mounting holes may have HeliCoils. Intake or exhaust manifold mounting holes may not be added or relocated. Holes must take standard intake manifold bolts.
Head gasket surface milling tolerance for Late
Model is 0.00” to 0.050” from true 23.00 degrees of stock valve position.
VALVES - All valves must be identical in appearance and construction as an OEM type valve. No air directional devices will be permitted on any of the valve surfaces. Valve stems must have a minimum diameter of 11/32 inch. Stainless steel replacement valves are permitted. Valve lifters can weigh no more that 98 grams.
VALVE JOB - Three (3) angle valve jobs are permitted. When cutting the valve seat angles, no stone or grinding marks are permitted above the bottom of the valve guide. All cutting in reference to the valve job must be centered off the centerline of the valve guide. Upon completion of the valve job, the bowl area under the valve seat down to the bottom of the valve guide should still be the same configuration as far as shape and finish as it was from the manufacturer. Surfaces and/or edges where the cutter or stone has touched must not be polished. No hand grinding or polishing is permitted on any part of the head. Unshrouding of valves is not permitted.
VALVE SPRINGS & RETAINERS - OEM type single steel valve springs with damper and steel retainers allowed. Valve springs must retain all stock OEM replacement passenger car dimensions. No barrel wound or conical wound springs will be allowed. ALL windings must be parallel. Stock diameter spring must be used. Valve spring retainers must be OEM steel or stock or stock replacement steel only. Double valve springs with a max diameter of 1.450” will be allowed. Valve springs must have a height of 1.750” min to 1.080 max. No lightweight retainers will be allowed.
20F- 5.7 CRANKSHAFT
A. Only
stock production OEM crankshafts allowed. The main and rod journal size must
be stockfor the block being used. Original bore and stroke combination must
be maintained. The maximum allowable stroke tolerance for Chevrolet and Ford
will be +/- .015". Mopar will have +/- .005. Minimum main journal size .020 under stock. Minimum
rod journal size .030 under stock.
B. After-market crankshafts, knife-edge crankshafts, small journal
crankshafts will NOT be permitted.
C. NO machining or polishing of the crankshaft counterweights
allowed. NORMAL engine balancing will
be the ONLY acceptable modification that can be performed on this component.
No painting or Teflon coating. NO drilling of rod journals.
D. Minimum crankshaft weights are Chevrolet engines 50 lb.,
Ford and Chrysler 54 lb.
E.
Only standard OEM magnetic steel elastomer type harmonic balancers
will be permitted
20E- 5.8.1 CAMSHAFT Only
magnetic steel camshafts will be permitted. The maximum camshaft bearing journal
size must not be more that 1.875” (475mm)
A. ANY type chain will be
permitted. Belt-drive and gear-drive systems will not be permitted.
B. Only production sleeve type bearings will be permitted and must
be standard diameter for the production block being used. Needle bearings
will not be permitted.
C. Camshafts must be driven in the same direction of rotation as
that of the approved production engine.
E. Hydraulic cam and hydraulic
lifters must be used.
20F – 5.8.2 VALVE LIFTERS
A. Only magnetic steel hydraulic valve lifters will be permitted. Roller tappets, ceramic valve lifters, mushroom valve lifters and any type of mechanical assistance exerting a force to assist in closing the valve and/or push rod commonly known as rev-kits will not be permitted.
B. Lifter must be operative and pass a leak-down test as well as removal and inspection.
C. Valve lifters can weigh no less than 98 grams
20F- 5.8.3 ROCKER ARMS - Aluminum stud mounted rolle