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Modified
2007
1.FRAME: OEM complete, 1964 or newer, perimeter
American rear-wheel drive passenger car frame only. No sports car frames. Frame
must be full and complete, cannot be widened or narrowed, and must be able to
support roll cage on both sides, exceptions are: weight jack in original center
line of spring tower allowed; frame may be cut a maximum 36 inches forward from
center of rear end housing; horns may be removed in front of steering box;
front cross member may be notched and boxed for radiator and/or steering
clearance; maximum seven-inch wide opening in side of spring tower for spring
removal. Maximum two inch wide by four inch tail frame stiffener may be welded
directly to outside of left side frame rail. Minimum
wheelbase 108 inches, maximum 112 inches, both sides. Maximum overall
width (front or rear) shall not exceed 78 inches from outside of tire to
outside of tire. No part of frame can be lower than four inches from ground
except front cross member.
2. ROLL CAGE: Must consist of continuous hoops, minimum
1.75 inch O.D. tubing, with a minimum wall thickness of .095 inch for main
cage, frame-mounted in at least six places, low carbon or mild steel
recommended. Must consist of a configuration of front, rear
and top hoops connected by tubing on sides or side hoops. Driver's head
must not protrude outside cage with helmet on. Roll cage must be securely
supported and braced with minimum one cross bar in top halo. Foot protection
bar required. Main cage no further forward than rear of
engine. All bars forward of cage must be lower than hood.
3. DOOR BARS: All driver side door bars and
uprights must be minimum 1.5 inch O.D. and .083 inch wall thickness. Minimum
three driver side door bars, parallel to ground and perpendicular to driver,
and welded to front and rear of roll cage. Passenger side must have at least
one cross door bar, horizontal or angled, minimum 1.25 inch O.D. and .083 inch
wall thickness, and one top door bar, minimum 1.5 inch O.D. and .083 inch wall
thickness. Steel door plate, 18 gauge or .049 inch minimum thickness, must be
securely welded to outside of driver side door bars and cover area from top
door bar to bottom door bar and from rear hoop down-post to five inches in
front of seat. Must be visible for inspection.
4.BODY: Must be same width, front to rear, and parallel to
OEM frame. Engine compartment must remain open (no side panels). Hood must be
enclosed at rear. No panel in front of right door to engine compartment. No
inner panels. No car covers. Must have front windshield and
rear window support posts. Driver and passenger side windows must have
at least 12 inch opening (height and width), measured at center of window,
between lowest point at top of window, whether roof or
roll cage, and highest point at bottom of window, whether interior or body. May use Lexan in sail panels. May use full windshield. Must be
fiberglass or aluminum size roof, rounded in all directions. 5"
spoilers ok. Maximum four-inch plastic skirting allowed on bottom of doors and
quarters.
5.DRIVER
COMPARTMENT: Must have minimum three windshield bars in front of driver.
Lexan or aluminum cowl panel in front of driver can
be no wider than cockpit and no farther back than steering wheel. Minimum .125
inch aluminum, or .060 inch steel, complete floor pan required. Aluminum
high-back seat only and must be bolted in next to left side frame rail and
ahead of rear tires. Bottom of seat can be no lower than bottom of frame rail.
Driver must be sealed off from track, driveline, engine, fuel cell, canisters
and pumps. Oil coolers must not protrude above interior. Accumulators cannot be
mounted between driver and left-side door bars. No driver-adjustable devices
allowed while car is in competition. 6.FRONT SUSPENSION: All components must be steel, unaltered OEM, in OEM
location, and replaceable by OEM parts, exceptions are: tube-type upper
A-frames with or without aluminum or steel cross shaft, and mounts can be
moved; stamped steel OEM replacement lower A-frames; rubber, nylon or steel
lower A-frame bushings, no offset or bearing type; welded or bolted shock mount
on lower A-frame. Lower A-frames must be right and left, and of same design.
Lower A-frame mounts and bolt holes on frame must be in OEM location. OEM ball
joints only. Sway bar must be unaltered OEM.
7.STEERING: No rack and pinion. All components must be
steel, unaltered OEM, in OEM location, exceptions are: outer tie rod end and
adjustment sleeve may be replaced by a minimum .625 inch steel rod end and steel
tube; spindles can be ground for brake caliper clearance only; unaltered, OEM
replacement Pinto spindles with\\\\\\'IMCA\\\\\\' raised cast; bolt on spindle
savers allowed; steel steering shafts and knuckles only; steering quickener, steering wheel and quick release may be
aluminum; cockpit steering may be modified, must be kept on left side. Spindles
must be right and left, and of same design. Idler arm, pitman arm, and center
link must match frame.
8.SHOCKS: One steel, nonadjustable, unaltered
shock per wheel. One additional shock allowed in lift- or pull-bar area. No
bumpers or stops. No threaded body, front coil-over, air, or remote reservoir
shocks, or Schrader valves. Front half may be shielded. 9.SPRINGS: One steel, non-progressive coil spring,
and/or steel leaf spring per wheel only. One additional spring allowed on pull
bar or lift bar, may be progressive. Any coil spring must be at least 4.5
inches O.D. No torsion bars or air bags.
10.REAR SUSPENSION: No independent rear
suspension. All components must be steel. No covers allowed. All trailing
arms/link bars must be solid tubing. Rear of frame may be altered to accept
leaf or coil springs. Steel coil-over eliminators, or
steel or aluminum coil-over kits allowed - must conform to shock and spring
rules. One mechanical traction bar (pull or lift, not
both). Rubber bumpers allowed only on panhard bar and
mechanical traction bar. No sway bar. No chains, cables or tethers (except on
front of lift bar).
11.REAR END: Any steel approved OEM passenger
car or truck rear end (housing and carrier) allowed. Safety hubs (floater)
allowed. All components must be steel, except lowering blocks, axle cap, drive flange. Inspection hole required in
housing. Full steel spool, steel mini spool or welded rear ends only. Steel axles only. No quick change devices,
or cambered rear ends. One piece drive flange only. No torque dividing
differentials. No scalloped ring gears.
12.BUMPERS: Steel bumpers must be on front and rear at all
times and welded, or mounted with minimum .375 inch bolts. Must be minimum 1.25
inch O.D. tubing, .065 wall thickness on front - .095
wall thickness on rear. Two-bar front bumper must be mounted frame-end to
frame-end, no wider than width of material outside frame horns and with bottom
loop parallel to ground. Top bar must be directly above bottom bar, minimum 6.5
inches apart, measured center to center. 13.TIRES/WHEELS:
KK704 TIRE or G 60 TIRE 8"
steel wheels. RR Beadlocks only
14. BRAKES: Must be steel approved OEM, operative four wheel, drum or disc. Must maintain minimum OEM dimensions for
hubs/rotors and calipers, cannot be lightened. Bolt
pattern may be changed. Larger studs allowed. Rear rotors may be aftermarket,
minimum .810 inch thickness. Vented rotors only, no scalloped
rotors. No brake shut-off or pressure sensitive devices. One proportioning
device allowed, front to rear only. Brake lines must be visible.
15. EXHAUST:
Round tube headers only. Alt primary header tubes must enter directly
into one collector, at same point, at end of header.
16. FUEL
SYSTEM:
Mechanical or belt driven fuel pump only. Racing fuel cell required, maximum 32
gallon capacity, must be in minimum 18 gauge steel
container. Cell must be securely mounted behind rear axle, between rear tires,
minimum of four inches ahead of bumper, minimum often inches above ground. Must mount with minimum two solid steel straps around entire cell,
two inches wide and .125 inch thick. All cell mounts must be steel,
securely welded to frame/cage. Protective tubing must cover rear and extend
past both sides of cell. No part of cell shall be lower than protective tubing.
Fuel cell vents, including cap vent, must have check valves. Pick-up must be on
top or right side of cell. Limit of one fuel filter. No cool cans. No top flow
air cleaner housings. One naturally aspirated two- or four-barrel carburetor
only. No adjustable throttle bore carb spacers. 17. FUEL: Gasoline or alcohol only.
18. WEIGHT: Minimum weight
limit of 2,450 pounds, no tolerance, after race with driver in car. No weights
and/or loose objects in driver compartment or outside body. Weights must be
securely mounted to frame or roll cage and painted white with car number on it.
Must be attached with at least two .5 inch bolts. No
titanium, magnesium or carbon fiber products. No gun-drilled, tubular, hollow
bolts or studs. Steel fasteners only.
19. BATTERY/STARTER: One 12 volt battery only, must be
securely mounted between frame rails, and positive terminal must be covered.
Car must have capability of starting without being pushed or pulled. Car must
leave initial staging area on demand, unaided, or go to rear of that race.
Reverse-mount starters with OEM case transmissions only, see transmission rules
for specifics.
20. GAUGES/ELECTRONICS: No transmitting or listening devices,
timing retard controls, or digital gauges (including tach).
No electronic monitoring computer devices capable of storing or transmitting
information except analog tach. No adjustable
ignition control boxes. One 12 volt ignition box allowed,
must be out of driver's reach. No additional ignition accessories allowed. Only
change allowed to ignition box is one high-end rev-limiter setting. This
setting can be changed through one chip only, or an internal setting inside
box. No magnetos. No electronic traction control devices
21. TRANSMISSION/DRIVE SHAFT: Must have at
least two forward gears and one reverse, plus a neutral position. With engine
running and car in still position, must be able to engage car in gear and move
forward, then backward. OEM production type or aftermarket transmissions
allowed - two-speed, three-speed, four-speed and automatic. No five speed (or
more) transmissions, 'in and out' boxes, or quick change devices allowed.
Drive Shaft: Minimum two
inch diameter steel drive shaft and must be painted white. Steel
slip-yokes only. 360-degree drive shaft loop required and must be
constructed of at least .25 inch by two inch steel, or one inch tubing, mounted
six inches back from front U-joint. 22. ENGINE COMPARTMENT: Rear of engine (bellhousing flange) must be mounted at least 72 inches
forward from centerline of rear axle. Engine offset must be kept within two
inches of^ centerline of front crossmember with
engine level. Minimum 11 inch engine height from ground to center of
crankshaft. Radiator must be mounted in front of engine. Cooling system may be
modified. Overflow tubes must be directed to ground between frame rails. 23.
ENGINE SPECIFICATIONS: Any American make engine allowed. Steel heads,
block and oil pan only. OEM passenger vehicle production block only. No GM
Bowtie, Ford SVO or Chrysler W blocks. Stud-mounted rocker arms only, cannot
alter lifter bores. OEM firing order
cannot be changed. All engines must be able to be used in conventional
passenger car without alterations. Engine mounts cannot be removed or altered.
Castings and fittings must not be changed. No machine work
on outside of engine. 'Wet' oiling system only.
External oil pumps only. Aluminum heads must bolt on 50lbs in front of motor
plate