Classic Car Rules
AND ATTACHED PARTS:
· Body must maintain standard windshield openings
and standard body size, no narrowing of bodies of any kind. No spoilers, air dams
or aerodynamic enhancing devices of any kind allowed any place on car or chassis.
These cars are intended to represent the era when they were originally racing.
· Bodies must be made of fiberglass and in the style of 1932, 1934,
of the 1940 era cars. Must have solid firewall and floorboard.
covering of side or rear windows is allowed. The passenger side window must be
cut out to allow driver exit. A roof hatch is allowed. Rear window openings no
larger than: SEDAN 9 ½ inches tall 44 inch width, COUPE 7 ½ inches
tall 47 inch width.
· No part shall protrude through the hood other
than hood retaining hardware.
· No mirrors allowed.
nerf bars can be of owners design as long as they protect from tire climbing as
much as possible. The front and rear of the nerf bars must be curved in toward
body closer than outer edge of tire. No open end bars exposed to other cars are
allowed. The nerf bars can come through the body and connect to the roll cage
and or the frame. They cannot be built of any stock over 1 ¾" outside
· A firewall and floorboard must cover as much of interior
area as is reasonably possible. The firewall and floorboard may be constructed
of aluminum or metal.
· Bumper Mounts (2 per side).
ROLL CAGE AND SUSPENSION:
· The frame must be from the 1978-1988
mid size metric GM. 106" wheel base minimum. The frame must maintain its
stock dimensions no holes or cutting to lighten. Roll cage set back: 22 inches
from center of rear end housing to closest point of roll cage, with a 1 inch tolerance.
A minimum of 1 ¾ inch by .095 inch O.D. Round steel tubing must be used
for roll cage. All 4 points of hoop bar must be welded directly to frame.
The frame is required to have an x-brace built in to the bottom of it. It must
be attached to the original frame no brackets off of frame.
· Only steel
shocks. $75 buy rule each.
· A fully adjustable dual master cylinder
brake pedal and master cylinder assembly is allowed. Any aftermarket steel caliper
· Springs, minimum of 5 inches outside of diameter. There
is no minimum or maximum length requirement. Front and rear springs must mount
in original locations. No coil-over shock and spring combinations allowed. The
spring mounts on the top of the rear end housing can be made or modified so springs
set on them properly.
· Weight jack bolts are allowed on all 4 corners
as are spring buckets. The side of the frame beside the front springs can be cut
out to owner's choice.
· Any size diameter front sway bar is allowed
from any stock production vehicle. Any mounting and adjustment design can be used.
GM, Ford, Chrysler or other allowed. Any rear sway bar allowed.
power steering gear allowed that will bolt on original GM location.
Any power steering pump and pulley assembly allowed. Any manual steering box allowed.
Steering quickeners are allowed. No rack and pinion units allowed!
Tie rods, drag links, idler arm and steering arm must all be OEM parts for this
chassis. Steering box and idler arm can be shimmed at the frame mount for best
alignment or clearance problems as from wreck damager or front frame rail alignment.
Aftermarket steel rotors are allowed on front spindles and any size lug studs
are allowed. OEM rotors can be reinforced for safety.
· Only metric
1978 to 1988 chassis spindles are allowed. No big metric spindles allowed.
Both front lower A-frames and all 4 rear control arms must be stock and original
length. Stock rear uppers may be modified.
· All frame and control arm
mount points must be in original location.
· Any upper A-frames can
be of owner's choice. Any location is allowed for vertical placement of inner
mounting point of upper A-frame or center line of A-frame pivot shaft. No minimum
clearance from frame to pivot shaft centerline is required. Upper A-frame mount
holes can be slotted vertically or horizontally if wanted.
· The front
chassis cross member can be trimmed off below drag link assembly for ease of repairs
· A catch can is required
to be connected to all radiators.
· Radiator must mount in front of
· OEM type belt drive water pump.
DRIVE SHAFTS AND
· Steel driveshaft only.
· A driveshaft
loop is required just rear of the front u-joint.
· The driveshaft must
be painted white.
· All cars are
required to have a master shutoff switch mounted in clear view and reach of the
driver's window for easy emergency crew access.
· No traction control.
No radios are allowed.
· OEM type distributor is required. Any HEI Large
· No 265, 283,
302, 327, 350 or 400 engines allowed.
· Any cast steel crank that weighs
minimum of 50 pounds may be used. Any steel rods that weigh the same or more than
the factory 5.7 length, no polishing of any kind.
· Only 305 cubic Chevrolet
engines allowed. They must be original 1 or 2 piece rear main seal design. Cast
iron blocks only. No 4-bolt main blocks allowed. A maximum of 0.060 overbore plus
tolerance equaling 3.806" allowed or 316 cubic inch. No additional tolerance
· Legal heads consist of the cast iron emissions GM factory
head. Replace it with this: Any 305 head with 184 max valves 53cc up to 1996 model.
No Vortex heads. They must be totally of the same design as original on the early
305 engines such as valve angles, valve cover mounting and total bolt pattern
for head bolts and intake bolts. Any head that shows definite performance gains
will be omitted from competition. No vortec head or intake combination allowed.
No porting or polishing allowed. Valve face and seat angle combinations are to
owner's option. Valve guides and seat replacement is ok but do nothing to improve
placement or locating angles. Heads are meant to only have a good basic head job
done and nothing to build significant horsepower gains in flow or other characteristics.
Resurfacing is allowed. The boss shoulder where the short head bolts go through
cannot be shorter than 7/8" or 0.875". Head gaskets must be no less
than 0.038" minimum thickness after compressed.
· Balancing of
all rotating parts allowed. No excessive metal removal. Must be a GM stamped crankshaft.
It can have your normal engine rebuilding work, but no major weight saving or
knife edging of throws allowed. Journal radius work is ok. The stock 3.48"
stroke must be maintained. A 2.065" rod journal allowed. The oil flow holes
may be chamfered.
· Minimum crank weight of 50 pounds.
of the 5.7" length normal production line stock GM rods for small blocks
allowed. Only 2.100" rod bearing size rods can be used. Any rod bolts allowed.
The beams cannot be polished.
· Valves must be of original 1.50"
and 1.84" diameters or smaller. Aftermarket stainless steel valves or such
equivalent are allowed. Brush or swirl finish valves are allowed but no mirror
finish valves. OEM stem size is required. Valve springs cannot be more than 1.275"
diameter. Springs can only be of original style consisting of 1 outer spring and
1 inner flat style damper spring. Springs must have no more than 120 pounds closed
· Any type steel springs retainer and keeper assembly
allowed. Any screw-in or press-in rocker studs allowed. These include 3/8"
or 7/16" rocker studs. Guide plates are allowed, as are hardened push rods
of any length. Stud girdles are optional. Stamped steel long-slot rocker arms,
roller tip rockers, or roller rockers are allowed. Rocker ration is optional.
The cam must be a flat tappet hydraulic design with original size diameter lifters.
No mushroom or roller lifters allowed. Hydraulic lifter only. The cam lift cannot
exceed .420" at the valve. This is checked with a solid lifter in place of
the hydraulic lifter. A 0.005" tolerance will be allowed or maximum due to
production tolerances allowed by cam manufacturers. Nothing more than that will
pass as legal. This is the maximum left allowed regardless of ration rocker you
have chosen to use.
· Pistons can be cast or forged. They must have
4 eyebrow marks defined in the piston dome flat top design. Defined dish pistons
allowed with only 2 eyebrows but no solid dome pistons allowed. Wrist pins can
be floating or pressed and bushings allowed. No gas porting of pistons from the
· Block decking is allowed. This is checked with a straight
edge held in line with wrist pin and engine cranked over with starter. Piston
must not hit straight edge above block while cranking. All normal engines rebuilding
machine work allowed on block. Oil drain holes can be screened. Oil paths can
be polished to assist in return flow. Do not get exotic with your work as you
could push over the limit. Minor work is allowed.
· Any standard production
stamped GM small block Chevy intake for trucks and cars allowed. Commonly used
casting numbers are 14057055, 14014432 and 10185063. They can be of 2 or 4 barrel
design and cast iron or aluminum. They must be of the late model emissions type
with EGR valve mount on the intake. It must be plugged off and not functional.
No vortec, off-road or marine intakes allowed. No porting or polishing allowed.
A carburetor spacer or adapter with a 1.5" maximum thickness allowed.
Any timing gear and chain allowed. No gear drives allowed. A cam walk button and
cam thrust bearing allowed.
· Any harmonic balancer may be used. There
is a $100 buy rule for balancer.
location is to be setting as close as possible to the center of the race car chassis
between the front frame rails.
· Setback-Second plug back to be no further
back than center of upper ball joint. 1 inch tolerance.
Any header may be used. There will be a $300 buy rule for headers.
· Gas Only, NO E85 or Oxygenated.
· Box stock
Holley 2 barrel 4412 only. No other 2 barrel or 4 barrel carburetor allowed. $300
buy rule on carburetor.
· Any fuel pump allowed that mounts on original
engine fuel pump location. No belt drive or electric fuel pumps allowed.
Any air cleaner is allowed as long as it does not force outside air into the air
cleaner as in a ram air effect. Any flow directional device used inside the air
cleaner is permitted.
· A fuel cell is required of no more than 8 gallon
capacity. It must be mounted above and between the rear springs. Rear side of
fuel cell cannot be further than 3 inch rear of rear most point of rear end assembly
cover. A maximum of 2270 cubic inch outside displacement allowed.
· Engine must retain a wet sump system. Flow routing can
be of owner's choice. Remote oil tanks are not allowed.
· No dry sump
REAR AXLE ASSEMBLY:
· The rear axle assembly
for 78 thru 88 midsize GM metric cars such as Monte Carlo, Cutlass, Regal or Grand
Prix. Either 7.5" or 7.625".
· No 9 inch Ford or quick change
· Gear ration - ANY
· Any steel axle may be used
· The carrier for the ring gear can be of owner's choice
no full spools, a locker positrack and spider eliminator or welded spiders or
mini locker. GM CARRIER ONLY.
· Standard drum brake set-up or standard
OEM disc brakes on rear axle assembly with steel caliper such as Camaro or Firebird.
NO AFTER MARKET ALLOWED.
· Only the GM TURBO
350 automatic transmission is allowed. No turbo 400, Power Glide or MANUAL transmissions
allowed. All length 350 turbo transmissions allowed. Cases with Chevy and B.O.P.
bolt patterns allowed. Transmissions buy rule $450 with convertor.
A stock torque convertor is required. A 12 inch outside diameter is required.
No valve pedals.
· Maximum tread width on
front and rear is 76 inches.
· Width is determined at the axle of the
spindle centerline and at the widest point on the tire sidewall.
REQUIREMENTS AFTER RACE:
· Minimum car weight is 2500 pounds with
driver after race.
WHEELS AND TIRES:
· Only 8 inch wide
and 15 inch diameter steel wheels allowed.
· Only 2 inch, 3 inch and
4 inch offset wheels are allowed on either side.
· Only 8 inch wide
by 15 inch tires.
· 26.5 Or 27.5 American Racer Medium Compound or Hoosier
Medium Compound Tire.
drilling, grinding, acid dipping, coating, cutting or any other means allowed
for purposes of weight reduction, aerodynamics, air flow or any other purpose
allowed on engine, body, frame, or any other part of car.
NOT CLEARLY DEFINED IN THESE RULES WILL BE ILLEGAL.
PROTEST AND SAFETY:
See Race Track Rules and Fees.
REAR BUMPER - Safety cable
¼ or larger or chain on both sides
HEADS - Any 305 with 184
max valve 53cc up to 1996 model NO vortec
FUEL - NO E-85 or oxygenated
BUY RULES - Shocks $75 each
to protested can swap for $500
Minus Carberator and Adapter, Fuel Pump, Power
Steering, Fan Blades and Pulleys