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Author Topic:   IMCA QUESTION
redneck racing
posted April 18, 2003 05:41 PM
What are you allowed to gut out in an IMCA streetstock and what interior tin do you need to have? Ive seen some pics looks like you need to keep the trunk and mount the cell on top of it somehow, looks like you cant gut out the trunk lid either. Eddie

posted April 18, 2003 07:01 PM

The rule and/or regulations set forth herein are designed to provide for the orderly conduct of racing and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events, and by participating in these events, all participants are deemed to have complied with these rules. No expressed or implied warranty of safety shall result from publications of or compliance with these rules and/or regulations. They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to a participant, spectator or official. The race director shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in his opinion do not alter the minimum acceptable requirements. No expressed or implied warranty of safety shall result from such alteration of specifications. Any interpretation or deviation of these rules is left to the discretion of the officials. Their decision is final.
Revised and Updated November 1 2002. Revisions or clarifications are underlined. Refer to Official 2003 I.M.C.A. Rule Book or ""
This is an entry-level division. No driver holding a current I.M.C.A. license in any other division is eligible to compete in an I.M.C.A. hobby stock. Unless otherwise noted, all parts on these cars are to be approved OEM and must match the make and year of car.
1. SAFETY EQUIPMENT: Snell SA95 or SA2000 helmet required and must be worn at all times car is on the track. Roll bar padding (Fire retardant recommended) required in driver compartment. SFI approved full fire suit, fire retardant neck-brace, and gloves required (shoes recommended). Arm restraints or drivers-side ribbon or mesh window net (minimum 16"x20") required. Window net to be mounted so latch is at top front of window. Five point safety belts, sub belt, shoulder harness required. Belts and shoulder harness must be mounted securely to roll cage and are recommended to be no more than one-year-old. Kill switch required within easy reach of driver and must be clearly marked "OFF" and "ON".
2. FRAME: Any American made rear wheel drive passenger car. 1960 or newer, full frame or unibody with factory steel top. Frame must match body. 107.5-inch wheelbase minimum for full frame cars, 109-inch minimum wheelbase for unibody cars. Maximum one inch difference from side to side. Rear of frame behind rear tires, form a point no further forward than one inch behind factory seam, may be replaced in stock location with two-inch by three-inch steel tubing with .095-inch wall thickness, same length as material removed. Factory seam must remain visible. Unibodies must tie rear frame to front frame. Frames may be 'X' braced. No Camaros, Firebirds, Mustangs, etc..
3. ROLL CAGE: Main cage must consist of continuous hoops, minimum 1.75-inch O.D. tubing, with a wall thickness of at least .095-inch, low carbon or mild steel recommended. Four-post roll cage required, front down bars and rear hoop must be welded to OEM frame. With helmet on, driver's head must not protrude outside cage. Rear hoop must have 'X' brace, consisting of one full horizontal and one full diagonal bar, 1.25-inch O.D. and .083-inch wall thickness. Front down-bars must be tied together. Passenger side front down bar must be maximum 9 inches from top of door. Must be minimum 40-inches between front and rear down bars at top of door panel. Maximum 41 inches from top center of windshield to front edge of rear hoop and maximum 13 inches to front edge of top halo. Top halo must be minimum 40 inches across, outside to outside. Rear hoop may be a maximum of 10 inches in from bottom of opera window. Minimum one cross bar in top halo. May have two bars for protection in front of radiator, behind bumper, within confines of body, no wider than stock frame horns. May tie frame horns together. Required down bars (kickers) and engine hoop must be minimum 1.25-inch tubing, with .083-inch wall thickness. Fuel cell protection required, must be mounted frame rail to frame rail, no higher than fuel cell, inside trunk area with maximum 1.75-inch tubing. All bars, front and rear, must be inside body.
4. DOOR BARS: Minimum three door bars, both sides, at least 1.75-inch O.D. and .095-inch wall thickness, must be as parallel with the ground as possible, and located perpendicular to the driver. Must have four uprights tied from frame to top door bar on driver side, three on passenger side at least 1.75-inch O.D. and .095-inch wall thickness. Steel door plates, 18 gauge or .049-inch minimum thickness metal, must be securely welded to outside of door bars on driver's side. Plate must cover area from top door bar to rocker panel and from rear down post to five inches in front of seat. Must be visible for inspection.
5. BODY: All bodies must be I.M.C.A approved, match frame and completely stock OEM in stock location. Sunroofs and T-tops must be reinforced and enclosed. Aftermarket plastic nose pieces allowed, recommended to match body. No spoilers, hood scoops or ground effects. Unaltered steel hood and trunk only. Hood must be separate from fenders. No gutting of hood or trunk. Hood and trunk must be securely fastened and back of hood must be sealed off from driver compartment with metal. No overlapping or shortening of body panels. All windows in body must remain open. Maximum seven-inch metal sun visor allowed only across top of windshield opening. All glass must be removed. All doors must be welded or bolted shut. Front inner wheel wells and splash aprons may be removed. Rear wheel wells may be removed to middle seam. Fenders and quarter panels may be trimmed for tire clearance ONLY.
6. DRIVER COMPARTMENT: Minimum three windshield bars in front of driver. Aluminum high-back seats only, bolted to roll cage (not floor). Driver shoulders may be no further back than front edge of B-pillar. Driver must be completely sealed off from track, driveline, engine and fuel cell. Dash not to extend more than 24 inches back from center of lower windshield opening. Dash must be flat except for cowl in front of driver. No other interior tin or covers. Inside rear quarter panels, below window level, may be cut out. Doors may be gutted. No cutting out of firewalls, floor, roof, kick panels or trunk floor, except for roll cage clearance. All holes in front and rear firewalls and floor are to be covered with metal. Rear firewall and speaker deck must be metal and be of stock design for that make and model. No mirrors.
7. FRONT SUSPENSION: All components must be steel unaltered, approved OEM, in stock location, and match frame. OEM rubber A-frame bushings only. All A-frame mounts and bolt holes on frame must be in stock location. Bolt on spindle savers allowed. No spacers, lumber, chains or cables.
8. STEERING: All components must be steel unaltered, approved OEM, in stock location and match frame. Steel steering shafts and knuckles only. No steering quickeners, No remote reservoirs on power steering pumps. Stock steel accessory brackets only.
9. SHOCKS: Must be approved OEM steel passenger car shocks. No racing shocks. All four shocks on car may be claimed for $30, counting as one claim on card, following shock claim procedures (see rule book). Refusal to sell is same penalty as engine claim refusal.
10. SPRINGS: One steel spring per wheel only. All coil springs must be minimum 4.5-inches O.D. and non-progressive.
11. REAR SUSPENSION: All components must be steel unaltered, approved OEM, and match frame. OEM rubber control arm bushings only. No independent rear suspension. All control arm mounts and bolt holes on frame must be in stock location. No spacers, lumber, chains or cables.
12. REAR END: No floater rear ends. Steel axles only. Nine-inch Ford rear end allowed, but must be mounted like stock rear end (centered) for that make and model. Must be welded or mini spool. No torque dividing differentials.
13. BUMPERS AND RUB RAILS: Must be approved OEM in stock location, capped to fender, with no reinforcement. Maximum one inch by two inch steel rub rails bolted to body from fender well to fender well and rear quarter panel, flush with body.
14. TIRES AND WHEELS: Stock (OE) 205/75, or 205/70, 14-inch or 15-inch passenger tires only. All four tires and wheels must be same size. Tires must be inside body. No racing or snow tires. No softening, conditioning, siping or grooving. Must be maximum seven inch wide D.O.T. stamped steel wheels with standard bead bump - must weigh a minimum of 21 pounds. No racing wheels or mag wheels. Reinforcing of stock wheels recommended. One-inch steel lug nuts required. No bleeder valves.
15. BRAKES: Must be unaltered, approved OEM, operative four wheel, disc (front) and drum (back) brakes. Master cylinder must be in stock location. No antilock brake systems. No aftermarket brake pedal assemblies, brake shut-off or bias adjuster. Steel brake lines only, must be visible. Rotors may be redrilled for different bolt pattern or larger studs.
16. EXHAUST: Cast iron exhaust manifolds only. No center dump type manifolds. Exhaust must extend past firewall and turn towards ground. Must remain dual exhaust, no crossover or 'Y' pipes. No exhaust sensors. Mufflers recommended.
17. FUEL SYSTEM: Mechanical push rod fuel pumps only. Must use OEM unaltered approved two barrel carburetor and intake manifold for that engine. May remove carburetor choke, but no other alterations. $50 cash claim on carburetor, following carburetor claim procedures (see rule book). Refusal to sell is same penalty as engine claim refusal. No hi-rise or marine intake manifolds. Air cleaner top cannot direct air into carburetor. No top flow air cleaner housings, cold air boxes or air cleaner duct work. Maximum 22 gallon racing fuel cell required, must be in minimum 18-guage steel container. Must be securely fastened in trunk above level of stock trunk floor, by minimum of two .125 inch thick, solid steel straps, two inches wide around entire cell. Metal firewall must be between driver and fuel cell. All cell mounts must be steel, securely welded on frame/cage. No adjustable fuel cell mounts. Fuel cell vents, including cap vent, must have check valves. Fuel lines through driver compartment must run through metal pipe or metal conduit. No fuel filters in driver compartment. Limit of one fuel filter. No cool cans.
18. FUEL: Regular unleaded or 10% Ethanol blend gasoline only, no additives.
19. WEIGHT: No ballast allowed. No titanium, magnesium or carbon fiber products, parts or components. Steel fasteners only.
20. BATTERY AND STARTER: One 12-volt battery only, must be in marine-type case securely mounted in metal frame behind seat or in trunk area. OEM starter required and must bolt in stock location. Must have capability of starting without being pushed or pulled. Must leave initial staging area on demand, unaided, or go to rear of that race.
21. GAUGES AND ELECTRONICS: No transmitting or listening devices, digital gauges. No electronic monitoring computer devices capable of storing or transmitting information except tach. No ignition control boxes. OEM ignition only. All ignition rotors, caps, coils and modules must remain stock appearing. No electronic traction control devices ($10,000 fine).
22. TRANSMISSION AND DRIVESHAFT: All forward and reverse gears must be operational.
(A) Manual transmission must be approved OEM, with single-disc clutch inside explosion-proof steel bellhousing. Steel OEM flywheel only - 16 LB. Minimum.
(B) Automatic transmission must be approved OEM, with original bellhousing and torque converter containing a minimum or three quarts of fluid. Torque converter must have a minimum .125-inch plug. Must have approved scattershield (may be constructed of .25 inch by three-inch steel, 270 degrees around flexplate).
(C) Steel drive shaft (minimum 2.5-inch diameter) and slip-yokes only. Drive shaft must be painted white. 360-degree drive shaft loop required and must be constructed of at least .25-inch steel by two-inch steel, or one-inch tubing, mounted six inches back from U-joint.
23. ENGINE LOCATION: Must be in stock location, using and OEM stock mounts. Metric and Ford frames must have back of fuel pump in front of crossmember, and crossmember may no be altered or moved.
(A) Steel V-8 block, heads and intake only.
(B) Maximum 361 cubic inches (GM): 363 cubic inches (Ford): 370 cubic inches (Chrysler).
(C) Maximum compression ratio is 9.0 to 1. Flat top pistons only, no gas ported pistons.
(D) Cylinder heads must be unaltered approved OEM and minimum 76 cc combustion chamber. No Vortec heads, GM approved steel head numbers are - 267, 336, 339, 388, 393, 441, 445, 454, 487, 493, 545, 598, 624, 642, 862, 881, 882, 920, 991, 993, 997; Ford - no after market or W2 heads, 360 cubic inch heads only. No porting, polishing or alterations of any kind to heads, disqualification and $250 fine if illegal.
(E) Engine must appear strictly stock. GM with GM, Ford with Ford, Chrysler with Chrysler. No 400 or larger cubic inch parts allowed. Stroke must match block. Harmonic balancer may not be altered.
(F) Must have unaltered approved OEM cast iron two barrel intake. No porting, polishing or alterations of any kind to intake, disqualification and $250 fine if illegal.
(G) No full roller or roller tip rocker arms, roller lifters, or stud girdles. Studs may be pinned or use non-shouldered ***** -in type.
(H) Minimum two-core approved steel or aluminum radiator. No aluminum water pumps on G.M. cars. Steel or aluminum V-belt pulleys only. Overflow tubes must be directed to ground, between frame rails. Accumulators and Accusumps must be mounted under hood. Stock steel accessory brackets only.
(1) Compression ratio using Whistler and cubic inches using pump.
(2) Visual inspection of part numbers, casting numbers and flat top pistons.
(A) $325 (U.S.) cash claim on engine, flywheel and balancing plates - $25 of this goes or wrecker pulling engine.
(B) Claim does not include - 1. Flywheel, 2. Clutch, 3. Pressure plate, 4. Bellhousing, 5. Valve cover breathers, 6. Carburetor, 7. Starter, 8. Motor mounts, 9. Sending units and switches for oil pressure and water temperature, 10. Fan and pulleys, 11. Clutch ball, 12. Clutch arm, 13. Throw-out bearing, 14. Dip stick, 15. Water pump, 16. Fuel pump, rod and plate, 17. Distributor, 18. Plug wires, 19. Water outlet and restrictor. EXHAUST MANIFOLD GOES WITH ENGINE.
NOTE: During engine claim, exhaust manifold must be pulled to inspect heads and one spark plug must be removed to check for flat top pistons prior to transfer of engine to claiming driver. If, at this time, heads or pistons are found illegal, claimed driver is disqualified and suspended from all I.M.C.A. sanctioned events until such time as a $250 fine is paid, for first offense. Claimer has option to accept or decline engine. If claimer declines, claim is not charged against him/her. Second offense penalties will be same as engine refusal, loss of all I.M.C.A. points, 30-day suspension and $1,000 fine.
27. POINT STRUCTURE: POINT STRUCTURE AND PROCEDURES: - Refer to Official 2003 I.M.C.A. Rule Book or ""
28. EIRI: (Except in rare instances) Decisions of I.M.C.A. Official(s) are final and binding without exception. In some cases, track safety rules may take precedence over I.M.C.A. rules - any discrepancy between I.M.C.A. and track rules should be brought to the attention of I.M.C.A. Any rule changes or clarifications during the course of the year will be published in inside I.M.C.A., the official newsletter of I.M.C.A., and will be considered as an official part of these rules.

You know when you have had a good night dirt racing when you jump in the shower and the tub is muddy brown for the first 10 minutes.

posted April 18, 2003 08:35 PM
no gutting trunk, trunk lid. dont take out floor supports, stiffeners, thats a big one i have been told.

dont gut the roof window posts.

you can cut out rockers, in i stocks not hobbies.

you can gut hood in i stock not in hobby.

also crazy rule is it says oem bumpers, even behind a nose, but they let you run any oem bumper off anything. yet oem,on spindles hubs means oem, exactly to match frame..

these are the things ive been getting clarified from imca directly and other drivers.


redneck racing
posted April 19, 2003 09:03 PM
Thanks guys I really appreciate the info. Eddie

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