Building Rules

2007 MINI STOCK - 4 CYLINDER RULES

FIRE SUITS--NECK BRACES---WINDOW NET OR ARM RESTRAINTS AND 5 POINT HARNESS ARE MANDATORY!!!
NO COURTESY NIGHTS ON SAFETY EQUIPMENT!!!
ANY THING THAT IS NOT COVERED BELOW MUST REMAIN STOCK.

ANY GREY AREA IN THE RULE BOOK WILL BE DETERMINED AT THE TRACK BY THE TECH OFFICIALS!

1. Wheel well may be enlarged to clear tires.
2. Doors may be gutted to add door bars. Must have 4 driver side bars & 3 passenger side bars.
3. Full stock /(stock appearing) floor pan back past the rear end.
4. Full stock /(stock appearing)fire wall in stock location.
5. All body panels must be stock. May be replaced with sheet metal, steel or aluminum.
6. Nose can be plastic or aluminum.
7. No bars outside the body.
8. No changing of the frame from 0” in front of the A frame to back of the rear spring.
9. You must have a shield to COMPLETELY separate the driver form radiator. (when not in stock location)
10. CARBURETORS: 4412 Holley 2 barrel or stock factory carbs,. 2 barrel only. Bottom of carburetor can be no larger than 1 11/16” diameter. Must be stock Ventura 1 3/8’. Gas tank MUST be in a steel container in the trunk of the car. (fuel cell recommended, ) Pump gas or racing fuel only/. No alcohol.
11. Battery Must be in the rear of the car separated from the driver and COMPLETELY SECURED. (recommend battery cover)
12. Doors must be welded or bolted shut.
13. MOTORS- NO TURBOS. 4 cylinder only. Stock blocks and stock heads. No stroked or destroked short blocks allowed. Stock crankshafts only FORD TO FORD, CHEVY TO CHEVY AND SO ON. Stock intake, any pulley s allowed. Motor must be in stock location-- no moving it back. Factory stock Fuel injection (AS IT CAME FROM THE AUTOMOBILE’S MANUFACTURER) allowed. Head may be shaved. No 4 wheel drives or engines in the rear. Distributors must be stock. No aftermarket allowed. Camshaft -- any hydro cams allowed. No solid lift cams unless came in car. Must have came in that year car.
14. TRANSMISSIONS- Factory stock automatic or standard Stock factory torque converts. No triple disk or mini clutches.
15. HEADERS-- any header is allowed.
16. Wheelbase must be factory stock.
17. No tires larger than 205-70-15 street tires. IMCA tires allowed - grooving ok.--
18. SPRINGS - Spring may be aftermarket. No wedge bolts or spring adjusters allowed.
19. SHOCKS - Must be stock. Must mount in stock position.
20. MUST HAVE RACING SEAT & SEAT BELTS. Seat & belts must be fastened to roll cage.
21. It cost $125.00 for an engine or drive train protest.
22. WEIGHT-- all cars must weigh 2500 lbs.
23. Drive shaft must be painted white. Must have drive shaft loop.
24. Stock front ends and stock swing arms must be factory stock only.
25. BRAKES may have 3 or 4 working brakes-- No adjustable proportioning valves allowed.
26. Fuel pumps may be stock or electric. If you have an electric pump you must have oil pressure shut-off switch.
27. Rear-end must be stock OEM type rear-end. Locked rear-end are allowed------ 9 INCH ok.
28. BEAD-LOCKS ALLOWED

2007 FACTORY STOCK BUILDING RULES

FIRE SUITS--NECK BRACES--WINDOW NET OR ARM RESTRAINTS AND 5 POINT HARNESS ARE MANDATORY!!!
NO COURTESY NIGHTS ON SAFETY EQUIPMENT!!!!
If any questions or gray area, ASK.
IF IT DOESN'T SAY YOU CAN THEN THAT MEANS YOU CAN'T!!!
THOSE ITEMS NOT ADDRESSED IN THE FOLLOWING MUST REMAIN STOCK AS PRODUCED BY THE ORIGINAL MANUFACTURER

BODY
1. Any year model American made car. Wheelbase must be factory stock. No tolerance. No subcompact cars. Rack and pinion cars must be factory stock parts only. If chassis is altered or steering parts (tie rods etc.) are not in stock location - it’s not legal!

2. Complete stock bodies and frame for that year model.
Body must be factory stock. All doors must be secured to body. Spoiler must not be wider than trunk lid.
Back of body must be enclosed fender to fender.
Hood and trunk must be pinned down.
Must have a complete stock factory floor pan(or stock appearing) and firewall.
Rear firewall must extend from bottom of rear window to bottom of floor pan.
Trunk area may be cut no further forward than pinion of rear end, must maintain inner fender well that attaches to floor pan.
Rear fender wells and firewalls may be trimmed for tire clearance.
Bumpers may be square tubing ~ must run inner rub rail ~ minimum size 1 inch round tubing on rear bumper.
Must have tow loops front and rear.
Front fender wells may be unbolted and removed.
Fenders may be trimmed for tire clearance.
All window openings must remain factory size.
All cars must have front dash in stock location.
Holes in firewall must be covered with metal or aluminum.
NO ENCLOSED INTERIORS.
All glass must be removed, including head and taillights. No rear view mirrors allowed.

3. Factory stock OEM frame front to rear. NO alterations allowed. This includes all cross members. DRIVE SHAFT LOOP MANDATORY. 6 INCHES BACK FROM FRONT U-JOINT--DRIVE SHAFT AND LOOP MUST BE PAINTED WHITE.

4. All weights must be painted white with your cars number on it and securely fastened to eliminate injury and hazardous conditions. Failure to have your cars number on a weight or failure to have it securely fastened is grounds for disqualification or position penalty at the discretion of the Tech official.

5. Factory gauges  may be removed. All flammable interior (carpet, headliner, interior side panel, rear seats, etc.) must be removed. Wiring harness may be removed and replaced. Racing seat MANDATORY. Driver/racing seat must be in stock location. No standard auto safety belts allowed. All cars must be equipped with racing safety-approved seat belts bolted to the frame with grade 8 bolts. Shoulder harness is mandatory.. 2 year to current date on belts. A 5-POINT HARNESS IS MANDATORY. The battery must be securely mounted in a battery box on the car. Battery must be covered.

6. Quick release steering wheel is optional MAY REPLACE STEERING COLUMN WITH round steering rod in stock location.

7. WEIGHT: 3500 lb. after race with driver. Top 5 cars weigh after heat races. Last chance transfer spots will weigh. Top 5 will weigh after "A" feature. When scales are set up.

ENGINE AND DRIVE TRAIN
ENGINE MUST HAVE BEEN AVAILABLE IN THIS VEHICLE. YEAR MAY BE INTERCHANGED. MUST HAVE 180 DEGREE EXPLOSION PROOF STEEL BELL HOUSING.

1. Engine must be stock production. Factory blocks only. GM to GM, Ford to Ford, Dodge to Dodge. Flat top or dished pistons, NO domes. Stock GM crankshaft 3.480 STROKE and STOCK GM RODS. No 90 or newer roller cam blocks. No bow tie or aluminum blocks. Casting numbers must be readable by tech official. No 400 blocks. Maximum cubic inch displacement to include clearance and wear is 360 for GM and Ford and 370 for Mopar. All others must not exceed 360 CID.

2. INTAKES: Any production cast iron intake. No porting of the heads or gasket matching of intake or heads. Intake may NOT be reworked under carb area. Carb spacer no taller than 1 inch allowed.
CARBURETOR CAN BE NO LARGER THAN A HOLLEY #4412 500 CFM 2 BARREL AND MUST PASS INSPECTION FROM TOP SIDE WITH GAGE. BOTTOM OF CARB CAN BE NO LARGER THAN 1 11/16" IN DIAMETER. (MUST BE STOCK VENTURA 1-3/8") MAY RUN ROCHESTER 2 BARREL (SUBJECT TO BE PULLED OFF AND CHECKED) .

3. Factory style distributors. (GM = HEI). No MSD distributors, No remote coils on GM distributors. No on board electronic devices capable of storing information allowed with the exception of recall Tachometers. No aftermarket electronic amplifying devices allowed. No aftermarket modules.

4. Hydraulic camshafts & lifters only, stock stamped rocker arms. NO flat tappet cams or mushroom cams. No roller hydraulic cams. Engines must not pull less than 18" of vacuum at 1000 R.P.M., Checked with track tachometer and track vacuum gage. If you are in doubt get with Tech official and check before competing. All cars in tech will be checked, plus we may have surprise tech at our discretion. Car must have capability for track tech official to hook up track tachometer and vacuum gage. Zero valve lash is required.

5. Heads must be stock OEM production only. No aftermarket heads. Casting number must be
Readable by tech official. 2.02 - 1.60 valves in GM is the largest size allowed. No aluminum heads or angle plug heads. Aftermarket valve springs OK. Screw in studs allowed. No angle milling of Blocks or heads, No Brezinski products, No porting, No polishing, No acid dipping, or anything similar allowed to heads or intake.

6. Stock cast iron exhaust manifolds, NO Headers. If you use mufflers, they must be securely fastened.

7. Factory stock automatics or standard transmissions. Must use factory stock OEM clutch disc and pressure plates on stock steel OEM flywheels only. NO EXCEPTIONS. AFTERMARKET CLUTCH PETAL OK. Stock type 10" or larger factory torque converters required on all automatics, temperature reading will be taken to ensure torque converter is not a dummy. Driver must be able to put car in gear from park/neutral and move forward and reverse at time of inspection. Must have drive shaft loop. Drive shafts must be painted white.

SAFETY REGULATIONS
1. Roll cages are required. No screw joint fittings allowed. The minimum requirement for all roll cages on all cars shall be an "A" shaped affair, constructed of at least 1 1/2" OD pipe with bars running from the upper right corner to the lower left corner, and just the opposite on the other side, forming a "X" as viewed from front to rear. There must also be a cross bar on top of "A" and 4 bars down the side and 4 bars around the top to complete a caged affair around the driver. All roll bar pipes must be at least .095 in thickness. Must have 4 kidney bars on the driver side and 2 bars on the passenger side. The driver and passenger doors inner liner only may be altered as necessary to install bars in the door area. No further gutting allowed. Gussets required. Bars may be added to protect radiator and gas tank areas. 3 1/4 inch bars in front of drivers window are mandatory, 1/8" doorplate is mandatory. From back of cage to 5 inches in front of seat top to bottom.

2. Fuel cells mandatory and must be in stock position, 32 gallon maximum. Fuel cells must be securely installed with 2 inch wide by 1/8 inch steel straps. Pump GAS OR RACING GAS only.
NO nitrous oxide or other performance enhancing chemicals allowed.

TIRES - WHEELS - SUSPENSION
1. IMCA, Street or track tires only. NO tires softer than a 55 compound allowed. NO recaps. 275/60/15 largest street tire allowed. All tires must pass tech inspection.

2. Steel racing wheels only. Maximum width is 10". Right rear bead-lock recommended. NO plastic or aluminum wheels. 5/8" stud and 1" Lug nuts MANDATORY.

3. All suspension must remain STOCK and in stock location. NO relocation of mounting points. Springs may be aftermarket No use of chains or other items to limit suspension travel. NO Weight Jacks or spring sliders allowed. Rear Springs must use stock upper spring pads in stock location.

4. NO racing shocks or heim mounted shocks allowed, Shocks must mount in stock location. Only one(1) shock per wheel. No spring assisted shocks unless it is Factory delivered for that vehicle. Must have at least 3 working brakes.

Rear suspensions must mount up factory stock. NO alterations. All control arms must mount up in stock positions. NO aftermarket control arms. No Johnny joints. Any stock American made car or 1.ton truck rear ends allowed. 9" Ford rear ends will be authorized in any car. However, all brackets and shocks must stay in their original locations. May switch to disk brakes on rear.
NO FLOATER or GRAND NATIONAL rear ends. All cars must remain on stock suspension for the car that it is under. NO gold tracs or any form of traction devices allowed. Locked rear ends required. 2008 all cars must pull 18” vacuum at 1000 rpms.

Visiting Factory Stocks will be allowed one (first night at the track in 2007) courtesy night (on minor infractions) and then must comply with the above rules.

2007 HOBBY STOCK BUILDING RULES

FIRE SUITS--NECK BRACES--WINDOW NET OR ARM RESTRAINTS
AND 5 POINT HARNESS ARE MANDATORY!!
NO COURTESY NIGHT GIVEN ON SAFETY EQUIPMENT!!

THOSE ITEMS NOT ADDRESSED IN THE FOLLOWING MUST
REMAIN STOCK AS PRODUCED BY THE ORIGINAL MANUFACTURER

BODY:
1. Any year model American made car. No front wheel drives allowed. Wheelbase must be factory stock. No tolerance. No subcompact cars. Rack and pinion cars must be factory stock parts only. If chassis is altered or steering parts are not stock and in stock location - it's not legal! All uni-body cars must be tied together. Must have a complete stock factory floor pan and firewall. Trunk area may be cut no further forward than pinion of rear end. Seats must be in stock location.
2. Complete stock bodies and frame for that year model. Stock appearing floorboards, rear fender wells and firewalls. Body must look factory stock, may use sheet metal STEEL OR ALUMINUM on doors and fenders. Bumpers may be square tubing ~ must run inner rub rail ~ minimum size 1 inch round tubing on rear bumper. Must have tow loops front and rear. Spoilers must not exceed 6 inches. 2 braces allowed, one at each end and cannot exceed 6" in length. Spoiler must not be wider than trunk lid. Back of body must be enclosed fender to fender. Rear fender wells may be cut out for tire clearance, must maintain inner fender well that attaches to floor pan. Factory stock OEM frame front to rear. NO alterations allowed. This includes all cross members. Hood and trunk must be pinned down. Stock steel hoods or fiberglass hoods. Factory trunk lid or stock appearing aftermarket trunk lid. Front fender wells may be unbolted and removed. Fenders may be trimmed for tire clearance.
3. All weight must be added in the form of roll bars or solid weights bolted securely to the frame of the car outside of the drivers compartment. All weights must be painted white with car number on it. No weights can be mounted above bottom of window opening.
4. All doors must be secured to body. All window openings must remain factory size. Must have 3 bars in front of drivers window. All cars must have front dash in stock location. Sheet metal only. Rear firewall must extend from bottom of rear window to bottom of floor pan. Holes in firewall must be covered with metal or aluminum. May replace factory dash with aluminum ~ no wider than 12 inches. 1/8" thick doorplate is mandatory. From back of cage to 5 inches in front of seat top to bottom. If enclosed interior must have access panel.
5. All glass must be removed, including head and taillights. No rear view mirrors allowed.
6. Gauges may be removed. All flammable interior (carpet, headliner, interior side panel, rear seats, etc.) must be removed. Racing seat mandatory. Wiring harness may be removed and replaced. Shoulder harness is mandatory. All cars must be equipped with racing safety-approved seat belts bolted to the frame. No standard auto safety belts allowed. Neck brace and window net (or arm restraints) are mandatory. A 5 point harness is mandatory! You must have a 12 volt ignition system--no 16 volts.
7. Quick release steering wheel is optional. Quick steer boxes OK. Steering remains in stock position.
8. WEIGHT: 3400 lb. after race with driver. Top 5 cars weigh after heat races when scales are set up. Last chance transfer spots will weigh. Top 5 will weigh after "A" feature.
ENGINE AND DRIVE TRAIN:
ENGINE MUST HAVE BEEN AVAILABLE IN THIS VEHICLE. YEAR MAY BE INTERCHANGED. MUST HAVE 180 DEGREE EXPLOSION PROOF STEEL BELL HOUSING
1. Engine must be stock production. Factory blocks only. No 90 or newer roller cam blocks. No bow tie or aluminum blocks. Casting numbers must be readable by tech official. No 400 blocks. Engine set back #1 plug even with upper ball joint. Flat top or dished pistons only. Maximum cubic inch displacement to include clearance and wear is 362 for GM and Ford and 370 for Mopar. All others must not exceed 362 CID.
2. INTAKES: Any production cast iron intake or bow tie cast iron intake. No porting of the heads or gasket matching of intake or heads. Intake may NOT be reworked under carburetor area. Carburetor spacer no taller than 1 inch allowed. CARBURETORS: 4412 Holley 2 barrel or stock factory carbs. 2-barrel only. Bottom throttle plate hole 1 11/16 inch. Top 1 3/8 inch. Factory style HEI distributors. No remote coils on GM distributors. No on board electronic devices capable of storing information allowed. No aftermarket electronic amplifying devices allowed. Tachometers only.
3. NO flat tappet cams or mushroom cams. No roller hydraulic cams. Engines must not pull less than 14" of vacuum at 1000 RPMs. All cars will be checked in tech. For 2007 season only cars that were in points the 2006 season at Plumerville speedway will be exempt from vacuum rule.
4. Heads must be stock OEM production only. No aftermarket heads. Casting number must be readable by tech official. 2.02 - 1.60 valves in GM is the largest size allowed. No aluminum heads or angle plug heads. Aftermarket valve springs OK. Screw in studs allowed.
5. Headers are legal.
6. Factory stock automatics or standard transmissions. Must use stock appearing clutch disc and pressure plates on steel flywheels only. Stock type factory torque converters required on all automatics. Driver must be able to put car in gear from park/neutral and move forward and reverse at time of inspection. Must have drive shaft loop. Drive shafts must be painted white.
7. There is a $125.00 tear down rule on each: pistons, cams, lifters, rockers & porting heads and
intake; flywheels/clutch; drive line. Driver only may protest. $25.00 of the money goes into the drivers point fund.
SAFETY REGULATIONS
1. Roll cages are required. No screw joint fittings allowed. The minimum requirement for all roll cages on all cars shall be an "A" shaped affair, constructed of at least 1 1/2" OD pipe with bars running from the upper right corner to the lower left corner, and just the opposite on the other side, forming a "X" as viewed from front to rear. There must also be a cross bar on top of "A" and 4 bars down the side and 4 bars around the top to complete a caged affair around the driver. All roll bar pipes must be at least .095 in thickness. Must have 3 kidney bars on the driver side and 2 bars on the passenger side. FOR 2007 ~ MUST HAVE 4 BARS ON DRIVER?S SIDE. The driver and passenger doors inner liner only may be altered as necessary to install bars in the door area. No further gutting allowed. Gussets required. Bars may be added to protect radiator and gas tank areas. 3 1/4 inch bars in front of drivers window are mandatory. 1/8" doorplate is mandatory.
2. Gas tanks must be in stock position. Fuel cells mandatory. 32 gallon maximum. Gas tanks/cells must be securely installed with 2 inch wide by 1/8 inch steel straps. Pump, racing or aviation gas only. NO nitrous oxide allowed.
TIRES - WHEELS - SUSPENSIONS:
1. IMCA, Street or track tires only. Any asphalt takeoffs on the front and rear. NO tires softer than a 55 compound allowed. NO recaps. 275/60/15 largest street tire allowed. All tires must pass tech inspection.
2. Steel racing wheels only. Maximum width is 10". Right rear bead-lock recommended. NO plastic or aluminum wheels. 5/8" stud mandatory.
3. Racing springs allowed on front and rear. Adjustable/Cheater weight jacks on front only.
4. Racing shocks allowed, must mount in stock location. No heim mounted shocks allowed. Must Have 3 or 4 wheel brakes, valve must be in engine compartment. After-market brake pedals and master cylinders are OK. Rear suspensions must mount up factory stock. NO alterations. All control arms must mount up in stock positions. NO aftermarket control arms. No Johnny joints. Any stock American made car or 1 ton truck rear ends allowed. All cars must remain on stock suspension for the car that it is under. NO gold tracks or any form of traction devices allowed. All rear ends must be locked.
OK. GM rear ends MUST have axle retention. ( C- Clip eliminators ).
5. A 9 inch Ford housing highly recommended. GRAND NATIONALS ok

2007 STREET STOCK BUILDING RULES
FIRE SUITS--NECK BRACES--WINDOW NETS OR ARM RESTRAINTS AND 5 POINT HARNESS ARE MANDATORY!!!!
NO COURTESY NIGHTS GIVEN ON SAFETY EQUIPMENT!!!!!!
ANYTHING NOT ADDRESSED IN RULES DOESN'T MAKE IT LEGAL!

1. Any American made production car or truck. Wheelbase must remain stock for chassis used. Front spindles to rear end housing on chassis must be stock OEM frames. Right rear frame rail may be altered (not moved ~ in 2007) for tire clearance ONLY! Uni-body cars must be tied together with square tubing. All cars must have drive shaft loop and drive shaft must be painted white. Must have tow loops on front and rear. Minimum of 3 kidney bars in the drivers side door and 2 bars on passenger side. FOR 2007 ~ MUST HAVE 4 BARS ON DRIVER'S SIDE.
3 1/4" bars in front of driver's window are mandatory.
2. Roll bars required. No screw joint fittings allowed. The minimum requirement for all roll bars shall be an "A" shaped affair, constructed of at least 1 1/2" OD pipe with bars running from upper right corner to lower left corner and the opposite from the other side of car, forming an "X" as viewed from front to rear. There must also be a cross bar on top of "A" and 4 bars down the side and 4 bars around the top to complete a caged affair around the driver. All roll bar pipes must be at least .095 in thickness and must have an additional support extending from rear upright to rear position of frame. No concrete reinforcement steel may be used. Gussets are required at all door bar welds.
3. Stock appearing OEM factory production bodies only. Must be stock Detroit production Olds, Buick, Pontiac, Chevy, Ford, AMC appearing bodies. NO Late Model style bodies allowed. Rubber nose and tail pieces allowed. Interior may be enclosed. Driver and passenger windows must open to a minimum of 12". Front of roof may be dropped 2 inches from stock height. Rear of roof must be in stock location. Cars cannot be altered in size. Front and rear firewalls mandatory. No rear view mirrors allowed. Must have drivers compartment floor pan, may be fabricated. Rear spoiler must not exceed 8" in height. 3 forward braces, may not exceed 12" long. Sheet metal or aluminum doors and fenders allowed. Side skirts allowed. Factory trunk lid or stock appearing aftermarket trunk lid ~ steel or aluminum. Rear end must have enclosure ~ must go from trunk lid to rear bumper ~ minimum width 36".
4. All cars must be equipped with racing safety-approved seat belts bolted to the frame or sub-frame. Drivers seat and steering must be in stock location. Racing seat is mandatory. Neck brace and window net (or arm restraints) are mandatory. 1/8" thick doorplate is mandatory. Back of cage to 9 inches in front of seat bottom to top.
5. Gas tanks must be in stock position. Fuel cells mandatory. 32 gallon maximum. Gas tanks/cells must be securely installed with 2 inch wide by 1/8 inch steel straps. NO nitrous oxide allowed.
6. Bumpers may be square tubing ~ must run inner rub rail ~ minimum size 1 inch round tubing on rear bumper. All cars must remain stock appearing. Quick steer boxes allowed. Must have a chain loop in front and rear for wreckers to hook to.
7. WEIGHT: 3200 lb. after race with driver. All weights must be securely mounted to the frame of the car outside of the drivers compartment. All weights must be painted white with numbers on it. Top 5 cars weigh after heat races, when scales are set up. Last chance transfer spots will weigh. Top 5 will weigh after "A" feature.
MOTOR:
CUBIC INCH MAXIMUM LIMITS (INCLUDES CLEARANCE AND WEAR)
GM - 364 FORDS - 364 CHRYSLER - 370 or 50 lbs weight bolted in front or fire wall/behind engine.
1. Engines must be stock appearing. ENGINES 364 AND SMALLER MUST HAVE Flat top pistons or dish pistons may be forged. Lifter bore must be OEM spec. Aluminum intakes allowed. Any mass production intake with a factory part number must be readable by tech official. Must pass tech inspection. No exceptions. Carburetor -- Holley 500 CFM 2 barrel carbs will be measured at the throttle bore 1 11/16" OD at the Ventura 1 3/8" OD. No BORING, NO ALTERATIONS, NO EXCEPTIONS. Any type header ok including, zommies or 180 degrees headers. No on board electronic devices allowed. No electronic monitoring computer devices capable of storing information except Tachometers .
2. Stock production or mass-produced cast iron aftermarket heads only.(exception aluminum heads must bolt 50 lbs I front of fire wall.)   Factory part number must be readable by tech official. On GM, Ford or Mopar maximum valve size allowed 2.05 - 1.625. AMC must be stock valve size. No exceptions. Angle plug heads ok. Stud girdles guide plates - roller rockers are allowed. Aftermarket valves and springs allowed. Must be steel valves only. Porting of heads allowed. There is a $125 tear down rule on: valve size. Must have cash to tech official in the infield immediately after feature is over. $25 of tear down money goes to driver point fund. Engine setback will be allowed to centerline of the upper ball joint to the center of the #1 spark plug hole.
DRIVE TRAIN:
1. Transmissions: Only OEM production type transmissions will be allowed: 3 speed, 4 speed and automatics. Clutch must be on crankshaft inside of bell housing. Driver must be able to put car in gear from park/neutral and move forward and reverse at time of inspection. Automatics may have bypass valve.
2. A 9 inch Ford or GN housing highly recommended. GM rear ends MUST have axle retention. Gold tracks or spools in rear end OK. Aluminum drive shafts allowed. Drive shaft must be painted white. Grand Nationals allowed.
3. No direct drive allowed. Mini-clutches allowed. Triple discs OK. You must have blow-proof bell housing.
TIRES - WHEELS - SUSPENSION:
1. Street or track tires only. Any asphalt pull offs. No Late Model dirt tires allowed. Must pass tech inspection. No tires softer than a 55 compound. Street tires OK - but not larger than 275/60/15. Steel 10" wide wheels maximum. Bead locks ok. 5/8" wheel studs MANDATORY. Tires may be grooved. No recaps. Mud caps on right side only.
2. Rear suspensions: must mount up factory stock for that frame. no alterations. No J-Bars. Stock lower OEM control arms. No alterations allowed. Bushings may be replaced. Weight jack bolts allowed. Rear shocks can be remounted inward. 3 link ok . If it came with a torque arm [ late model camaro and firebird ] you may stiffen up the factory torque arm . No torque absorbing devices. Solid upper arms or heim joints allowed. Upper arms must be in stock position. Racing shocks may be relocated. Racing springs allowed.
3. Front suspensions: Stock front lower "A" frames. No alterations. Must mount in stock location.
Upper "A" frames may be moved for caster-camber changes. Tubular upper "A" frames allowed. Front shocks may be moved for jack bolts. All strut mount cars must use struts that bolt in stock position. No alterations to mounts. Aftermarket racing shocks allowed. Racing springs allowed. Adjustable tie rods allowed.
BRAKES:
1. Brakes can be stock production or aftermarket. Brake pedals may have brake valve in reach of driver. Brake adjusters are allowed within reach of the driver. Calipers must be stock OEM. No aluminum calipers or aftermarket calipers allowed. Calipers cannot be lightened. Rotors can be lightened.

2007 Economy Modified Building Rules
2007 Economy Modified Building Rules.
FIRE SUIT--NECK BRACE--WINDOW NET OR ARM RESTRAINTS AND 5 POINT HARNESS ARE MANDATORY!!!
NO COURTESY NIGHT GIVEN ON SAFETY EQUIPMENT!!
IMCA MODIFIED RULES APPLY WITH THE FOLLOWING EXCEPTIONS:
MOTOR:
1. ENGINE 362 max cubic inch with GM 350 block & stock stroke 3.48 crank. Flat top pistons. Ford 361 (351 stock block & stroke) Mopar 370 (360 stock block & stroke). NO 400 BLOCKS.
2. Camshaft lift rule: .480" measured at the valve OR 14 inches of vacuum. Aluminum roller rockers allowed. (Valve can only move .480" at top of the valve) .030 MAX. LASH ALLOWANCE.
NO ROLLER CAM SHAFTS OR ROLLER LIFTERS.
3. OEM CAST IRON HEADS: SR or VORTEC heads OK. 2.02" intake & 1.60 exhaust valves max. 23 degree heads only. No angle plugs allowed. No porting or polishing of heads & intake.
No match porting of intake or heads. No angle milling. No ALUMINUM heads.
4. No mismatching of engine parts. GM to GM, Ford to Ford.
5. No ALUMINUM parts except for intake manifolds, pulleys, valve covers, radiator, water pumps, roller rocker arms and flywheel.
6. No belt drive fuel pumps.
CARBURETOR AND FUEL
1. Carburetor can be no larger than a Holley #4412 500 CFM 2 barrel and must pass inspection from top side with gage. Bottom of carburetor can be no larger than 1 11/16" in diameter. (Must be stock Ventura 1-3/8") May run Rochester 2 barrel.
2. Alcohol and racing fuel OK. NO ADDITIVES.
3. Rear fuel cell panel optional.
4. RECOMMENDED: IF a new car is being built or the fuel cell is being replaced, replace with 22 gallon maximum capacity.
SPOILER.
1. 8" MAXIMUM rear spoiler MANDATORY. To be measured deck to full length of spoiler including wicker bill & angles.
WEIGHT.
1. Weight with driver after race 2500 lbs minimum. NO MOUNTED WEIGHTS ABOVE DECK METAL!
TIRES AND WHEELS.
1. ANY ASPHALT PULL-OFFS OR MODIFIED PULL-OFFS. NO tires softer than a 55 compound allowed. NO recaps.
2. Steel wheels only 10" maximum. Bead-locks allowed.
TRANSMISSIONS.
1. STANDARD: OEM 3 or 4 speed only. Clutch, flywheel & pressure plate 10" minimum. Must have steel blow proof bell housing. Automatics must have working 10" torque converter minimum. No direct drive or mini clutches. No BERT or BRINN transmissions .
IGNITION.
1. MSD ignition 6 AL allowed.
2. NO MAG type distributors.
PROTEST.
There is a $125 car protest fee. If you win the protest, you will get $100 back. If you loose protest, the $100 will go to the driver protested.  $25 GOES TO POINTS FUND     . If the car is found to be illegal, the driver will loose the points and money for that night.
A Window net OR ARM RESTRAINTS is Mandatory in 2007. This is IMCA rule. No Traction control devices.
Visiting E-MODS will be allowed one courtesy night (on minor infractions) and then must comply with the above rules.
After 4 feature wins at Central Arkansas Speedway LLC, the track has the option to tear down the 4 time winners engine. If the engine is found to be legal after inspection, the track will supply the driver with a replacement gaskets . ONE HEAD GASKET AND ONE INTAKE GASKET SET after tear-down is complete.