RULE BOOK DISCLAIMER
The rules and/or regulations set forth herein are designed to
provide for the orderly conduct of racing events and to establish
minimum acceptable requirements for such events, and, by
participating in these events, all participants are deemed to have
complied with these rules. NO EXPRESS OR IMPLIED WARRANTY OF SAFETY
SHALL RESULT FROM PUBLICATION OR COMPLIANCE WITH THESE RULES AND/OR
REGULATIONS. They are intended as a guide for the conduct of the
sport and are in no way a guarantee against injury or death to a
participant, spectator or official.
The race director shall be empowered to permit minor deviation from
any of the specifications herein or impose any further restrictions
that in his opinion do not alter the minimum acceptable
requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL
RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any interpretation or
deviation of these rules is left to the discretion of the officials.
Their decision is final.
CHASSIS SPECIFICATIONS
1. Roll bars must be 1-1/4 inch steel pipe or
1-3/8 inch OD chrome moly tubing or larger and be permanently welded
to the top of the frame. Rear roll bar and frame must be a minimum
of 30 inches outside diameter where welded to the frame and at
shoulder height. Frame rails from front to back must be tapered and
not bent. Tubing must have a wall thickness not less than .090. Rear
roll bar recommended to be .120. No bolting of cage or side
extensions to support roll cage. All roll bars must be padded around
driver. No spot welding.
a. Frame rails must be 2x4 inch rectangular tubing with a wall
thickness not less than .0835 of an inch. Box frame must tie into
rear roll cage and extend from rear of cage towards the front of the
engine and be a minimum of 58 inches in length at the shortest
point.
b. Hood and body panels are required and must meet the approval of
the technical committee. Body style to conform to generally accepted
sprint car standards. Top wing to have a 16 square foot maximum
size. No bi-wings. Side panels must be straight with no contours and
be a maximum of 30 inches wide with a ¼ inch tolerance and 70 inches
long with a one inch tolerance. Wing may not be adjustable in any
way while car is in competition. Lower front corners of side panels
may not impair driver's vision. Side panels may not extend more than
3-1/2 inches in front or rear of wing core. No more than 2 inches of
reinforcing bends on top and bottom of side panels. Kick outs no
longer than 2 inches may be used on back of side panel. Side panel
must cover wing core. A wicker bill no higher than 2 inches may be
used on rear of wing core, this is in a addition to the 16 square
feet. Wing may not extend beyond outside edge of rear tires. Single
plane wings only. Top wing may not be more than 14 inches off of
roll cage with a one inch tolerance. Penalty to be to put car to the
rear of the finishing order. Wing must meet the approval of the
technical committee. No rudders on body of wing.
c. No front wings. Sides of hood may be no higher than 2 inches.
Side wings or corn pickers may not extend past the front of the
firewall and be no higher than the rear tire with no side
extensions. No other wings, hood extensions, tail wings or wedge
shaped body or tail parts permitted.
d. Fuel cell with bladder mandatory and should have an approved,
safe vent. Do not attach cell to frame by bolting or fastening to
plates on bladder.
e. No driver adjustable shocks.
f. Total weight of car and driver may not be
less than 1775 pounds. There will be a 25 pound weight allowance.
Weigh in to be after any event, weight will be measured and car will
be teched as car comes off the track in the condition that it took
the checkered flag with driver in car. No bolt on weight, must be
securely and permanently fastened. Weight measured by speedway
scales.
2. Engines may be no farther back than the center of the wheelbase.
3. Open drive shafts must have a sling to protect the driver and a
steel plate on the bottom of the seat at least 1/8 inch thick.
4. Quick change rears optional with steel axle or Winters aluminum
spec rear axle. Sprint Car aluminum rear axles optional with a
maximum tube opening of 1.90 inches. Knock offs optional. Must use
solid wheel adapter on right rear.
5. Front bumper must be of frame width and axle level. Rear bumper
must meet the approval of the technical committee. Bumpers must be
bolted or equivalent, no rivets.
6. All cars must be equipped with an approved type of quick release
safety belt, shoulder harness and anti-sub belt. All safety belts
must be anchored to the frame. Shoulder harness must be fastened to
the bracing bars and loop over a bar at shoulder height.
7. Good brakes required. Right front brake optional, left front must
have a rotor with a minimum of a single caliper. Rear brakes
optional as follows: Rear of car must have steel rotors and a dual
brake caliper on both rear wheels. Inboard brake optional, must be
vented steel rotor minimum thickness of .725 of an inch with dual
brake caliper, right rear caliper optional. If inboard brake used,
rotor must be clear of battery when rear axle is pushed front
against frame upright and aluminum rotor on right rear optional.
Guard between rotor and fuel cell recommended.
8. The steering must be safe and meet approval of technical
committee. No power steering. Knee protection mandatory, aluminum
wrap around style with padding recommended. Steel rod ends required
on drag link. Tether recommended.
9. Approved floor from cowl past the driver and a tight firewall
required.
10. The wheelbase may not be less than 90 inches on the left side.
11. Maximum wheel width of 16 inches excluding bead lock. Steel
wheels only on the rear. Aluminum or steel wheels only on the front.
No plastic or carbon fiber wheels.
12. Weight jacks permitted.
13. Driver's head rest and throttle return are mandatory.
14. All cars must have rub rails no wider than the outside of the
wheels and must be constructed in such a manner that no wheels can
get locked with those of another car. Rub rails must be bolted or
equivalent, no rivets.
15. All cars must have a fuel shut off valve on the right side of
the driver's seat or the right side of dash.
16. Drivers should wear fire retardant drivers uniforms and gloves
plus arm restraints at all times when they are in the car on the
track. High back seats recommended.
17. If transponders are used for scoring, they are to be mounted at
a designated position.
ENGINE SPECIFICATIONS
ALL ENGINES UP TO 320 CUBIC INCHES
1. Engines limited to 320 cubic inches.
2. No aluminum engine block or heads. Main bearing caps must be iron
or steel
3. No roller tappet cams.
4. Any piston, any valve, any steel crank, any steel rod.
5. Factory high performance parts approved. This applies to block
and heads.
6. DART II Sportsman head permitted, must be unported and meet specs
outlined in rule number six for engines over 320 cubic inches below.
7. 320 engines must use 358 head rule or weigh 1800 pounds.
ENGINES OVER 320 CUBIC INCHES
1. Engines limited to 358 cubic inches.
2. Block must be a standard production block or approved stock
dimension after market block that was under 358 cubic inches
originally. No aluminum blocks. Chevy bow-tie block and Ford SVO
blocks permitted.
3. Crankshafts must be factory production or stock dimension after
market cast iron or steel crank Stroke must remain stock. Crank may
be turned a maximum of .040 under. Chevy stroke of 3.480, Ford
stroke of 3.50 and MOPAR stroke of 3.31 or 3.45. No swapping of
cranks. Ford SVO crank with part number M6303-H351 permitted. MOPAR
high performance crank with part number P4120312 permitted. All
cranks must be a minimum of 46 pounds in weight. Penalty for using a
light weight crank to be suspension for season in addition to
penalties outlined in general rules.
4. RODS - A production rod from a V-8 engine under 358 cubic inches.
Modification of rod length prohibited. Rods, block and crank to be
used in the same combination that factory originally manufactured.
Any stock dimension steel rod (No titanium) may be substituted.
Stock dimension includes length, wrist pin location and journal
size. Approved after market rod must be in factory condition, no
polishing or reworking. No addition or removal of metal other than
normal balancing. All 358 engines must have a 3/4 inch inspection
hole in the left side of the oil pan opposite the number one rod
journal Any windage tray which would block the view of the rod must
be removed. Ford permitted to use a 6 inch length rod with SVO
crank.
5. Flat top pistons only. Zero deck, piston may not be above the
deck of the block.
6. Any factory steel head, or DART/ World Products Sportsman II
steel head. DART/World Products head must have casting number of
1037. Must have a 60 cc minimum combustion chamber, no grinding in
chamber. No aluminum heads. No relocating rocker arm studs. No
porting or polishing. Matching ports in the intake port of head
only. Depth maximum for matching ports is 3/4 of an inch. Lifter
bore must remain stock. The valve seat area can be cleaned up using
a maximum 80 degree grinding stone. No additional hand or machine
work permitted. CC measurement of intake runner of head to remain
stock with the exception of matching port. Vortec heads permitted
with approved casting numbers of: Small port #25534351 and Large
port #25534371. RHS ProAction cylinder heads permitted for Ford
engines with approved part numbers #35301, #35302, #35303.
7. Production valve or production replacement, steel or stainless
steel only. Any spring, any retainer permitted. Roller rockers
permitted. Stock valve guide angle. No relocating valve
8. Flat tappet cams only. No mushroom or roller cams.
9. Block must be cast iron. All factory identification numbers
and/or part numbers must remain on crank and heads. Main bearing cap
must be iron or steel.
GENERAL SPECIFICATIONS
1. Maximum of four barrels of carburetion.
Single carburetor only. No super chargers, fuel injection or turbo
chargers.
2. Any approved intake other than a smoke ram or tunnel ram. Intake
height to be a maximum of 8 inches measured from the top of the
carburetor bowl using a straight edge from the bowl to the #3 or #4
runner of the intake manifold.
3. Balance assemblies optional,
4. All cars must be self starting for the feature, clutch optional.
No automatic transmission. Stock configuration clutch must have a
full scatter shield of at least 1/4 inch thick steel or an approved
bell housing. Failure to do so will result in an automatic
suspension and loss of points.
5. Fuel - Methanol only according to Federal Standards of Purity,
Grade A or AA. No additives of any kind including top lube.
6. No electric fuel pumps or pressurized fuel systems. No inboard
(in driver's compartment) fuel pumps.
7. Gear drive units permitted. No externally adjustable cam timing
device.
8. Any battery ignition. No magneto. No computer operated or
controlled parts. No traction control devices. Gel filled battery
recommended.
9. No needle bearing cam, crank or rod bearings permitted.
10. Tires – Two types of right rear tires may be used. One, a
American Racer 34.0/17.0-15GT track tire with the distinguishing MC
on the sidewall. The MC being the prefix to the compound. The MC-2
or MC-3 compound permitted. The second option is a Hoosier 105/18-15
plated (HTMA) spec tire. The D-12 or D-15 compounds are permitted.
11. All cars must be registered to prevent duplicate car numbers.
Please call the speedway office to register your car number,
12. All cars are subject to inspection and tear down at any time.
13. Any car using an engine block and/or cylinder heads that are
visibly cut, ground or machined externally for the purpose of weight
reduction must add 25 pounds to the car from the center line of the
engine forward. Weight must be securely fastened but must be able to
be removed to verify weight.
THE ABOVE RULES ARE INTENDED TO BE A GUIDELINE IN CONSTRUCTING A
CAR. THE DECISION OF TRACK OFFICIALS IS FINAL.
CALL BEFORE YOU BUY OR BUILD. Williams Grove Speedway, 1 Speedway
Drive, Mechanicsburg, PA 17055 717-697-5000
