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Thunder Bomber

 

Ran under Unified Stockcar Racing Association (USRA).

 

GENERAL - Tech man has right to check this every week.

1 - No nitrous or traction control.

2 - After 3 times of refusing to tear down - you will be disqualified from competing in this division the remainder of the year.

3 - A driver cannot compete in this division and a different division on the same night.

4 - Cars must be neat in appearance.

5 - Cars must weigh 3300 pounds with driver after race.

6 - 8" wheels max .25" tolerance - 14 or 15" - Must be same size all the way around.

7 - No dot racing tires.

8 - Any 70, 75, or 78 series street legal dot tires series radials - No directionals or competition tires.

9 - 8" towel city racing recap OK but must punch 55.

10 - May run beadlocks but must face outside.

11 - May run offset rims and wheel spacers.

12 - Stock brakes and master cylinders.

13 - OEM brake calipers only - No aluminum.

14 - Duel master cylinder OK - Adjusters OK.

15 - Headers are legal but must exit parallel to ground.

16 - RULE CLARIFICATION ON EXHAUST (EFFECTIVE APRIL 14TH) - NO TRI-WYE HEADERS, NO H-PIPES, AND NO X-PIPES.

17 - Aluminum radiator with made brackets OK.

18 - Fuel cell must be mounted inside of trunk with firewall between driver and fuel cell.

19 - Seat must be securely fastened to frame and or roll cage.

20 - Cars must have number on sides and top and able to be read by score tower.

21 - Stock unless other wise stated.

BODY - Visual protest only.

1 - No Late Model noses or fender flares.

2 - Stock unless otherwise stated.

3 - 1968 or newer American made car.

4 - No station wagons, trucks, jeeps, convertibles, mustangs, or pony cars.

5 - Rear of car must be closed - No holes or flaps.

6 - Must have a deck lid.

7 - May make front fenders and rear fenders.

8 - No side spoilers.

9 - Spoiler may not exceed 60" wide by 6" tall and no spill plates.

10 - Cannot exceed 48" from ground to the top of the rear spoiler.

11 - May run any replacement roof - Must be 48" X 50" - Don't do anything crazy.

12 - Aluminum door and fenders OK.

13 - 13" minimum door and rear glass opening.

14 - Interior can be boxed in.

15 - Front and rear bumpers - Rubber nose OK - Stock appearing - No cow scoop.

16 - Breather must be boxed in on all 4 corners and cannot exceed 2".

17 - May pull air from inside car but no forced air no forced air.

18 - Front inside wheel wells can be cut or removed for clearance but not excessive.

19 - All firewall holes must be covered.

20 - Must have stock firewall in original location.

21 - May replace dash with sheet metal - Interior metal cannot be higher than dash.

22 - Gutting hood and trunk OK.

23 - Bumper cannot exceed past the inside of the rear tire or must run a bumper cover.

24 - May use lexan in rear side windows.

WHEEL BASE / FRAME

1 - Frame must match make and model of car - 1" tolerance +/- allowed.

2 - No shortening of frame - Must be stock - No x-ing or cutting of frame.

3 - Length between spring eyes must be stock.

4 - Wheel base for make and model.

5 - Engine must be in stock location.

6 - Radiator must be in stock location.

ENGINE - BOTTOM END

1 - Any oem stock size engine - Max size 363 - 060 over bore max.

2 - Engine must be in original location - Aftermarket mounts OK.

3 - Repaired engine parts must be approved.

4 - ARP Rod bolts ok but must remain stock size - 3/8.

5 - 1 piece rear seal block OK.

6 - No high performance engines or special order parts.

7 - .060 over bore max.

8 - Stock blocks only.

9 - Must be stock replacement low compression piston.

10 - No flat top 4 eyebrow piston - Must be dished.

11 - Speedpro H423 NCP replacement piston OK.

12 - Pistons must be at least .009" in block.

13 - No bottoming of lifters.

14 - Stock crankshaft.

15 - No knife edging or lightening, etc.

16 - Cast crank must weigh 48 lbs.

17 - No stroking or destroking.

18 - No balancing.

19 - Journals may be turned no more than .060" .

20 - Rod width may not be less than .94 .

21 - Stock timing chain gear set only no offset key ways.

22 - Balancer 6 3/4 by 1" no machining.

23 - Engine must be in original location but may run aftermarket mounts.

24 - May run racing pulleys - No serpentine pulleys.

25 - Aluminum water pump allowed.

26 - No serpentine pulleys - v belt racing pulleys OK.

27 - After market fuel pump OK.

28 - After market power steering OK.

29 - 2 piece timing covers OK.

HEADS

1 - Any open chamber head ok but must meet the following criteria.

2 - May run stock replacement screw in studs or pin them.

3 - May run aftermarket valve cover.

4 - Heads cannot be less than 72 cc.

5 - No ange milling.

6 - Stock size of valve for make and model.

7 - Valve springs can be z28 springs.

8 - No cutting under 45 - No competition valve job - No 3 angle valve job.

9 - Shims can be used under valve springs with a limit of .60 per string.

10 - May use off set locks but not with shims.

11 - Rocker arms must be stock.

12 - No porting or polishing.

13 - Steel valves only.

14 - Stock stem diameter.

INTAKES

1 - Stock cast iron.

2 - No holley pattern factory intakes.

3 - No aluminum intakes.

CARBURETOR

1 - Stock 2 or 4 barrel only.

2 - No modifications except choke flap removal.

3 - No removal of choke horn.

4 - 600 Holley part # 1850 OK - Must be box stock with mr gasket adaptor part #1932.

5 - May use (2) .070 gaskets max.

CAM

1 - Stock timing chain only.

2 - Or Cloyes C-3023X adjustable timing chain OK.

3 - .390 - .410 lift.

4 - 112 lobe seperation +/- 1 degree.

5 - Advancing or retarding the cam in car with adjustable timing OK.

6 - Cloyes C-3023X only - No cam buttons.

7 - Stock cam or stock replacement cam only.

8 - Duration for intake + 2 degrees / -10 degrees.

9 - .006 - 256 degrees.

10 - .050 - 195 degrees.

11 - .200 - 95 degrees.

12 - Duration for exhaust + 2 degrees / - 10 degrees.

13 - .006 - 261 degrees.

14 - .050 - 202 degrees.

15 - .200 - 106 degrees.

16 - Must have 18" vacuum at 1000 rpm.

17 - Hydraulic cam and lifters only.

18 - Cams CS-274 Sealed Power and CCS-2 Melling and Comp Cam 12-105-3 are a stock produced cam and will be looked at with a little more variance. All custom ground cams will be required to meet the above specifications.

FLYWHEEL AND CLUTCH ASSEMBLY

1 - Stock steel flywheel - 14 lbs. minimum.

2 - Stock type clutch and pressure plate - Minimum 10.5".

3 - May use hydraulic clutch.

TRANSMISSIONS

1 - Must be stock with all working forward and reverse gears.

2 - Automatic transmission torque converter stock type and 11" minimum.

3 - May run transmission cooler.

4 - Aftermarket throw out bearing OK.

5 - Automatic transmissions OK.

6 - No lightening of gears.

7 - 3 speed straight drive cast iron transmission with all working gears.


8 - Straight drive transmission cars must have blow proof bell housing or scatter shield of 1/8 steel.

9 - May use hydraulic clutch.

DRIVE SHAFT

1 - Has to be stock for model of car or may run 2" driveshaft.

2 - No carbon fiber.

3 - A "U" or square type safety loop on front of drive shaft assembly is required.

IGNITION

1 - Stock type ignition.

2 - Stock type distributor only.

3 - No high performance distributors or high performance parts.

4 - No altering firing order.

5 - No msd's with boxes.

REAR ENDS

1 - GM 10 or 12 bolt rear-end.

2 - 9" ford or floater OK.

3 - Shocks have to be in stock location - May move for travel only - No angle change.

4 - May run aftermarket axels.

5 - Any gear ratio allowed.

6 - Locked or limited slip rear ends allowed.

7 - Full spools OK.

8 - no gun drilled axels.

9 - No gun drilled rotors or scallopped rotors.

10 - No lightening of any parts.

11 - All components must be made of steel.

12 - Disc brakes ok - Doesn't have to match model of car.

13 - Can cut top of trailing arms for pinion angle.

SUSPENSION

1 - Suspension must be stock.

2 - May run racing springs with adjustable buckets.

3 - Top a-frame can be cut or move top mounting perch.

4 - no adjustable blocks - 4" of lowering blocks max.

5 - Tube type a-arm on top oly OK - Non adjustable - Screw in ball joints on top OK.

6 - Can use heavy duty oem steering and suspension parts.

7 - Leaf or coil springs can be changed to stronger leaf or coil of the same type.

8 - Cutting of coil spring allowed - Rear shims on coils are OK.

9 - Adjustable or non adjustable spring buckets OK.

10 - Shocks must be in stock location in front.

11 - Adjustable buckets in rear OK.

12 - All hook up points on chassis must be in stock location.

13 - Rear shock location must be stock on top and can be moved on bottom for travel length only.

14 - Cannot change angle of rear shock.

15 - Top trailing arm may be cut for pinion angle only.

16 - Leaf spring cars may adjust perches for pinion angle.

17 - May adjust rear shackles.

18 - After market bushing in a-frames and trailing arms ok but may not swivel.

19 - No heim joints on any shocks.

20 - May run any stock body racing shock.

PROTEST AND CLAIM RULE

1 - Protest bottom - $500.

2 - Protest any 3 items - $300.

3 - Cam protest - $300 - Track keeps $100.

4 - Acceptance fee - $100.

5 - Track keeps $100.

6 - Tech man has final say.

 

 

 

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