1. No high performance parts allowed except as stated.
2. Wheel base 108.
3. Stock suspension - Aftermarket “A” Frame on top side
only allowed, . Lower “A” Frame must be stock for the car
that it is on.oem spindles only. Leaf spring cars - shackles
only, blocks allowed.
4. Engine - #1 plug even with ball joint max setback.
Bore and Stroke
A. Stock bore - +.060 maximum.
B. Stroke - Stock for CID of engine. Crankshaft may
be aftermarket, must be stock appearing, and weigh no less
C. Rods - Must be stock length for CID of engine.
D. Pistons. Flat top no gas ported. No less than .062 ring landings. The
weight for rod ,piston ,ring, pin and bearings must not be
E. Camshaft - 480 lift Hydraulic or
flat tappet cam only.
Roller rockers are OK.
F. Carburetor - Gas only. 750 Holley Max. 200 lb.
weight break. 600 Holley single line stock part # 080457.
G. Intake - Any aluminum. Max 1” adapter or spacer
plate. No porting or polishing.
H. Compression - 180 # maximum. Will be checked with
all plugs removed and throttle wide open until needle stops.
I. Heads - Stock heads and S/R heads. Must be stock diameter valves for
CID of engine. Small Block Chevy 1.940 intake, 1.500
exhausts. Small block Ford 1.940 intake, 1.600 exhaust. May
be aftermarket valves:solid steel only . Valve springs must
be stock diameter. No porting, polishing, grinding, etc. May
have pinned or screw in studs and guide plates. Three angle
valve job permitted. 170 cc. Runners max and combustion
chamber must be equal to factory
J. Ignition - MSD boxes allowed. Distributor type or
CD(Capacitive Discharge) Ignition systems only.
K. Rings, Rod & Main Bearings, Oil pumps, Cam and
Lifters, valves, valve springs, gaskets, plugs, plug wires,
push rods, bolts, nuts, etc. may be aftermarket.
L. May run aftermarket oil pans.
5. Rear End - Locked rear ends only.
Any factory type rear end. Must be mounted with stock
replacement brackets for the car that it is under Southwest
Speedway or equal. May be floater axle. May use rear disc,
calipers and hubs, must be same as factory.
(Example: front GM can be used on rear.) REAREND must
be in factory stock position, no trailing or leading.
Mounting points shall be the same as the factory for the
type of car that the rear end is being used under. Top trail
arms maybe shortened for pinion angle, must be the same
length, no hemi joint allowed in trailarms After market must
be equal to stock in length
and bushins Non adjustable .
6. Transmission - straight shift legal. Must have all
gears and be produced by manufacturer of car. Automatics
must have working torque converter.
Functional torque converter.
7. Clutch, pressure plate, and flywheel must be steel
factory type. Minimum weight of 34lbs with no tolerance. No
May be aftermarket. 10 ½” minimum diameter clutch.
8. Shocks – Steel bodied, only
no rebuildable as listed by manufacturer, non
adjustable only. 80.00
9. Safety Hub RF.
10. Wheels - 10in steel wheel max. Bead Lock allowed on
right rear and right front.
11. Tires - no racing or recapped tires. 275 x 60
maximum. No chemicals allowed.
12. Bodies - Must be full bodied cars or trucks. Top,
hood, and deck lid must be original or aftermarket and must
be stock appearing.
A. Quarter panels, doors, and fender may be made of
aluminum but must be made in separate pieces and be stock
B. Tubing may be used to tie sub frame together at
factory location, parallel only.
C. 8 in. rear spoilers and side spoilers .
13. Weight - 362 and under is 3200 lbs. Greater than
362 CID is 3500 lbs.
14. Fuel tanks - a mandatory firewall between driver
and fuel tank.
15. Headers - legal.
16. Frame section in front of A Frame mount and behind
rear suspension mounts may be replaced with tubing due to
rust or excessive damage.
17. All glass and flammable parts must be removed.
18. Roll bars - All cars must have a 4 point roll cage.
4 bars on driver’s side, 2 in passenger side (1 ½” minimum
OD black pipe.)
19. 1” diameter lug nuts minimum. Must have 5 lug studs
and lug nuts per wheel
20.ANY TIME IN DOUBT ALWAYS ASK.
SOME TYPE MUFFLER IS REQUIRED,
WINTERFEST Only: Along side Winchester Speedway Regular
Modified Stock Rules, also being allowed for
WINTERFEST ONLY: Light Weight
Clutches & Bert Transmissions will be Allowed, but MUST ADD
50 LBS next to the ENGINE. Normal Weight - 362 and under is
3200 lbs. Greater than 362 CID is 3500 lbs. With the Light
Weight Clutch or Bert Transmission Weight - 362 and under is
3250 lbs. Greater than 362 CID is 3550 lbs