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MODIFIED STOCK
RULES
1. No high performance parts allowed
except as stated.
2. Wheel base 108.
3. Stock suspension - Aftermarket “A”
Frame on top side only allowed, top mounts must be in stock
location. Lower “A” Frame must be stock. 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 than
48lbs.
C.
Rods - Must be stock length for CID of engine. Aftermarket
stock appearing rods must be of equal weight or greater.
Pistons: Flat top or dished only. Must not come above deck.
No forged.
D.
Camshaft - 480 lift Hydraulic flat tappet cam only. Roller
rockers are OK.
E.
Carburetor - Gas only. 750 Holley Max. 200 lb. weight break.
600 Holley single line stock part # 080457.
F.
Intake - Any aluminum. Max 1” adapter or spacer plate. No
porting or polishing.
G.
Compression - 180 # maximum. Will be checked with all plugs
removed and throttle wide open until needle stops.
H.
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: 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.
I.
Ignition - MSD boxes allowed. Distributor type or
CD(Capacitive Discharge) Ignition systems only.
J.
Rings, Rod & Main Bearings, Oil pumps, Cam and Lifters,
valves, valve springs, gaskets, plugs, plug wires, push
rods, bolts, nuts, etc. may be aftermarket.
K. 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 trail arms. No light
weight components allowed in the drive train.
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 modifications.
May be aftermarket. 10 ½” minimum diameter clutch.
8. Shocks – Steel bodied, no gas
shocks, a claim price of $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 appearing.
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. Safety - Must have working fire
extinguisher, driver fire suit, helmet with shield and
safety belts.
SOME TYPE MUFFLER IS REQUIRED
Updated 12/13/12
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