2012 Spring City Raceway
Modified Street Regulations

1. BODY. Aluminum or fiberglass allowed. Wedge type or stock appearing. No flat tops. 72" max width. No bump or rub rails on the outside of body.

2. SPOILER. 8" high, 72"max width. 3 supports. 8" high, 10" long max.

3. CHASSIS.
A. Stock front clip must have stock lower control arms.
B. Front clip must be from bellhousing to steering box min.
C. No aluminum frames
D. Aftermarket uppers allowed.
E. Aftermarket spindles and Wide Five hubs allowed
F. Rack and pinion allowed.
G. Any rear suspension allowed. 4-bar must punch 58 minimum at the right-rear after race. No tolerance
H. Max tire size 29.0/11.0-15
I. Coil springs - 5"minimum diameter. Except coilovers
J. Coilovers may be ran on front or rear.
K. No external canister shocks.
L. Steel brake rotors and calipers.

4. WHEEL BASE. 104" min.

5. WEIGHT.
A. Full frame car. 2700lbs
B. Clip car. 2800lbs
C. Tube frame - 2900lbs
Note: Track retains the right to change weight to even competitiveness of cars if need be.

6. WHEELS. Any aluminum or steel racing wheel, 14" max width.

7. FUEL CELL. Steel shell with minimum 2" steel straps.

8. FUEL. Gasoline only. No additives or nitrous.

9. DRIVE SHAFT. Any steel type, must be painted white with number on it. Safety loop mandatory.

10. REAR END. Any quick-change, floater, OEM allowed. Must have steel axle tubes.

11. TRANSMISSION. OEM or racing transmission (must have working clutch and reverse)

12. ENGINE
A. 363 cubic inch max
B. OEM steel block
C. Steels rods only, no aluminum or titanium. 6.60 max length.
D. Crank must be a minimum 50lbs with crank gear. 3.50 maximum stroke.
E. Aftermarket heads allowed. 23 degree standard runner heads. Must be as shipped from factory. No modifications allowed. No porting or polishing allowed. No angle milling allowed. Max valve. 2.02/1.60
OEM HEADS. Any modifications allowed.
NO ALUMINUM HEADS ALLOWED. OEM OR AFTERMARKET.
F. Any flat top piston allowed. No gas porting allowed.
G. Roller rockers allowed. No shaft mounted rocker arm
H. Any cast aluminum or cast iron intake. May port and polish intake runners. No spacers between heads and intake allowed
I. One four barrel carburetor. 4150 series only. Choke horn may be removed. Maximum 2" carburetor spacer allowed. No tolerance, one gasket per surface.
J. Any flat tappet cam. OEM lifter bore. No mushroom lifters
K. Wet sump oiling system only. No external pumps.
L. Max engine setback, 4" from center of ball joint.

13. IGNITION. Aftermarket ignition allowed. No crank triggers
NO TRACTION CONTROL DEVICES OF ANY KIND ALLOWED.