East Lincoln Speedway

THUNDER BOMBERS RULES

 

GENERAL:

No nitrous or traction control If driver refuses tear down 3 times, disqualified for remainder of year

Cars must be neat in appearance.

Any driver in this division may compete in one other division on the same night

Car weight must be greater than 3300 lbs. (3350 lbs if firewall is not in stock location) after the race with driver

Cars must have numbers on sides and top readable by scorer stock unless otherwise noted.

 

BODY:

Visual protest only.

No late model noses or tails.

Will remain stock unless otherwise stated.

1968 or newer American made car, no station wagons, trucks, jeeps, convertibles, mustangs, or pony cars.  Rear end of car must be closed, no holes or flaps or hinges.

Must have deck lid.

Front and rear fenders may be fabricated.

No side spoilers.

Rear spoiler may not exceed 60” wide by 6” tall.

Rear spoiler shall not exceed 48” from ground to top of spoiler.

Roof may be replaced if necessary but must be 48” x 50”.

Aluminum may be used for doors and fenders.

A minimum of 13” for all door and rear glass openings.

Interior may be boxed in.

Front and rear bumpers may be rubber like, stock appearing.

No holes in hood. If air cleaner is coming out of hood, it needs a hood scoop.

Must be closed in front and sides, but can be open in back. Complete air breather must be covered.

May pull air from inside car, no forced air.

Front or rear inside wheel wells may be cut or removed.

All firewall holes must be covered.

Front firewall must be in stock original location,patching OK. If firewall is not in stock location, car must weigh 3350 lbs min. If weight is to be added it must be added to passenger side door roll bars no higher than waist high. If car is to weigh 3350 lbs is must be displayed on front passenger side to be seen at scale.

Must have stock floor pan. May patch.

Dash may be fabricated with steel or aluminum, but no higher than original.

Gutting trunk and hood ok.

Lexan OK for side and rear windows.

Bumper will not go past the inside of the rear tire.

 

FRAME:

Frame must match make and model of car, +/- 1”

Frame may not be shortened, stock only, no X braces or frame cutting

Length between spring eyes must be stock

The wheel base must be stock

Engine to remain in stock location

Radiator must be in stock location, may be Aluminum

Fuel cell must be inside of trunk with firewall between cell and driver

Seat must be securely fastened to frame and/or roll cage

 

SUSPENSION:

Suspension must be stock unless noted

Racing spring with adjustable buckets OK

No adjustable lowering blocks, 4” max of fixed blocks

Top A frame may be may be tube type, non-adjustable, bolt in ball joints only on top A frame.

Heavy duty OEM steering and suspension parts OK

Leaf or or coil springs may be changed to stronger of same type

Cutting coil springs OK, rear coil spring shims OK

Adjustable or non-adjustable spring buckets OK

Front shocks must be in stock location

Rear adjustable buckets OK

All chassis hook up points must be in stock location

Rear shock location must be stock on top but may be moved on bottom for travel length only

Can not change angle of rear shock

Top rear trailing arms may be cut for pinion angle only. No mono balls in any trailing arms.

Leaf spring perches and shackles may be reset for pinion angle

After market replacement bushings in A frames OK but no Heim Joints

 

SHOCKS:

Any stock body racing shock allowed, $125 buy rule per rear shock. $70 buy rule per front shock

No Heim Joints on any shocks.

 

WHEELS AND TIRES:

Steel wheels must be used, 8” wide, +/- .25”, 14 or 15 inch. Must be same all around

Tires may be any 70, 75, or 78 series street legal DOT tires

No directional or competition tires

TOWEL CITY recaps OK if 8” tread width, must punch 55 minimum after race

Bead locks OK right side only

Wheel spacers and offsets OK

 

BRAKES:

Stock brakes for make and model OEM calipers only

Dual master cylinder OK, Adjusters OK

No gun drilled or scalloped rotors

FLYWHEEL AND CLUTCH:

Stock steel flywheel, 14 lbs. min.

Stock type clutch and pressure plate, 10.5” minimum

Hydraulic or after market throw out bearing OK

3/16” steel shield over bell housing required or blow proof bell housing mandatory.

 

TRANSMISSION:

Stock type automatic transmissions with working torque converter OK, 11” minimum

Transmission cooler OK . No power glides.

No lightening or polishing of any gears

Must have all working gears

 

DRIVESHAFT:

Stock for make and model of car, 2” steel replacement OK

No carbon fiber or aluminum allowed

Safety Loop required around front of drive shaft

 

IGNITION:

Stock type distributor ignition only

Stock firing order only

No high performance HEI, or distributors with external boxes $150 buy rule minus plug wires.

 

REAR ENDS:

May use GM 10 or 12 bolt, any gear 9 inch ford floater or non floater allowed

No gun drilled axles

No lightening or polishing of any parts

All components must be steel

 

ENGINE:

Any OEM one or two piece seal block max 363 cubic inches assembled

Stock location only, after market mounts OK

Approved repair parts only, must be approved

No flat top or 4 eyebrow pistons

Speed-Pro H423 or equivalent piston acceptable replacement for stock dished piston

ARP rod bolts OK, if standard 3/8”

Stock cast replacement crankshafts OK

No knife edging or lightening allowed

Minimum crankshaft weight 48 lbs.

Stroke must remain stock

Stock rods with stock journals and pin diameters only

After market SFI balancer OK

Aluminum racing water pumps OK

Racing pulleys OK, no serpentine belts

After market fuel pumps OK

No windage trays

 

HEADS:

Any open chamber OK with following restrictions:

Stock production heads only

After market valve covers OK

Screw-in or pinned rocker screws OK.

Screw in studs may not have hex heads.

No guide plates.

Cannot be less than 72CC

No angle milling

Stock size of valve only for make and model, steel only

Z28 valve springs OK

No 3 angle or competition valve job, no cutting under 45 degree

Shims under springs maximum .060” under each spring

Stock rocker arms only, no long slot or roller rockers

Off set locks OK but no shims allowed

Stock valve stem only

No porting or polishing

Push Rods: Stock length and stock diameter required. Aftermarket and

Hardened ARE allowed.

Headers: Any headers- No Tr-Y's or no crossovers.

 

INTAKE MANIFOLD:

Stock cast iron

No Holley pattern intakes

No aluminum intakes

CARBURETOR:

Stock 2 or 4 Barrel

No modifications except may remove choke flap only

Box stock Holley 1850 OK with Mr. Gasket 1932 adaptor and 2 each .070 thick gaskets

 

CAM:

Stock or Cloyes C-3023X timing chain only, no cam buttons .390-.410 lift, 112 degree lobe separation, +/- 1 degree

Stock cam or Sealed Power CS-274, Melling CCS-2 or Comp 12-105-3 are approved

Hydraulic lifters only

Cam will produce 18” of vacuum at 1000 RPM

Amendment 11/9/18: There have been some interest in drivers wanting to run

Ford's. However, there was no cam number in the rules. We have done some research and these are the cams that are equal to the Chevy.

Ford Elgin E750-S

Chrysler Elgin E577-S

PROTEST AND CLAIMS:

Bottom End $600

Any other three items $300

Cam $300

Acceptance Fee $100. Track keeps $100 for any protest above

$500 claim rule on Quadrajet.

Tech man has Final and indisputable say