| MODIFIED RULES |

SEATS: Only custom manufactured aluminum seats, acceptable to series officials, will be permited. The seats must be
properly installed. All seats should have padded rib protectors. An adequate padded headrest, acceptable to series
officials, is mandatory.
SEAT BELTS & SHOULDER HARNESS: A lever type quick release latch must be fastened to the lap belt. A lap
belt not less than (3) inches wide is mandatory. Both ends of the lap belt must be fastened to the roll bar cage with high
quality bolts not less than 3/8 inch in diameter. The shoulder harness must be no less than (3) inches wide and must be
attached to a roll bar behind the drivers seat. Where the harness crosses the roll cage, it must pass thru a steel guide
welded to the roll cage that will prevent the harness from sliding side to side. Shoulder harness inertia reels will not be
permitted. A center (crotch) belt must be securely mounted to the lower seat frame at the bottom and to the lap seat belt
on the top. Where the belt passes through the seat edges, it must have a grommet installed, be rolled, and/or padded to
prevent cutting of the belt. All seat belts and shoulder harnesses must connect at the lap belt with a quick-release buckle
acceptable to series officials. Seat belts should not be used beyond (5) years. The date of manufacture should remain
visible at all times. All cars should have either an approved window net in the drivers door or arm restraints.
DRIVER UNIFORM: It will be required that at all times the driver wear a driving suit and gloves of fire resistant
material that effectively covers the body. It is highly recommended that drivers use a Snell SFA 3.2A/5 uniform with full
Nomex underwear.
HELMETS: Driver will be required to wear a full face helmet at all time while practicing or in competition. It is
recommended that helmets meet the specifications set forth in the Federal Motor Vehicle Safety Standard Regulations or
meet the specifications set forth by the American National Standards Institute Inc. All drivers must wear neck brace.
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,
except: weight jack in original center line of spring tower allowed; frame may be cut a maximum 36: forward from
center of rear end housing. Horns may be removed in front of steering box. Front crossmember 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 tall frame stiffener may be welded directly to outside of left side frame
rail. Minimum wheel base 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 crossmember.
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. Bodies:
1970 or newer American compact passenger car only, no panel cars or station wagons. Stock appearing front windshield
and rear window support unit, painted roll bars not acceptable substitute. May utilize a flat half-windshield, with no
wings, mounted to the roll cage. Must have a minimum of three windshield bars in front of driver. (b) Firewall and
floorboards are mandatory. All body parts should be recognizable as factory production vehicle. Fiberglass or metal
duplicates of body parts are permitted. Homemade body parts may be constructed of steel, aluminum, or fiberglass. All
NCRA cars in competition must have a complete paint job. Body must be the same width, front to rear, and parallel to
the frame. Original roof line of vehicle must closely be maintained. Must be full size roof. No wings or any other
ground effects are allowed anywhere outside or inside of car. Sail panels must closely resemble examples shown on body
diagram and be the same on both sides of car. Any reinforcing lips on rear of sail panel. Must be 180 degree bends. (d)
all NCRA cars must be numbered with large legible numbers on both sides, on top and rear panel. Numbers on sides and
top of car must be in contrasting color from body, be at least four inches thick and at least 20 inches high. (e) Sponsor’s
names must not interfere with car numbers and must be neatly lettered. (f) Engine compartment will remain open, no
side panels; hood sides may have maximum six inch drop and must be no further than rear of block.
(g). (optional) Rear of bodies to be solid panel at least eight inches high and include car
number and NCRA decal. (h) No panel in front of right door to engine compartment.
No inner panels. No car covers. (i) Driver and passenger side windows must have at least 12-inch opening, measured
at center of window, whether the roof or roll cage, and the highest point at the bottom of window, whether the interior or
body.
(b) SPOILERS: A rear spoiler not exceeding 5 inches of total material and not exceeding the width of the rear deck. A
maximum of four tapered supports may be installed on the front of the spoiler no higher than the spoiler.
DRIVER COMPARTMENT: Must have minimum three windshield bars in front of driver. 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 while car is in competition except brake adjuster. No mirrors or reflective sun visors.
4. FRONT SUSPENSION:
All components must be steel, unaltered OEM, in OEM location, and replaceable by OEM parts, except tube-type upper
A-frames with aluminum/steel cross shafts, and mounts can be moved. OEM replacement tubular control arms OK.
Lower A-frames must be right and left of same design; rubber, nylon or steel lower A-frame bushings, no offset or
bearing type, welded or bolted shock mount on lower A-frame.Lower A-frame mounts and bolt holes on frame must be
in OEM location
5. STEERING:
All components must be steel, unaltered OEM, in OEM location, except outer tire 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, raised cast, spindles must be right and left and of same design. 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. No rack and pinion.
6. SHOCKS
One steel, non adjustable, unaltered shock per wheel. One additional shock allowed on rear suspension. No threaded
body, front coil-over, air, or remote reservoir shocks. No Schrader valves.
7. SPRINGS
Steel or composite leaf spring allowed. One coil and/or leaf spring per wheel only. One additional spring allowed on
pull bar or lift bar, may be progressive. Any coil spring min 4.5 inches O.D. No torsion bars or air bags. .
8. 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/aluminum coil-over kits allowed. Must
conform to shock and spring rules. One mechanical traction bar (pull or lift, not both). All suspension parts must be
visible on both ends.
9. REAR END
Any steel approved rear end allowed. Safety hubs (floater) allowed. All components must be steel except lowering
blocks, cap and drive flange.Full steel spool, steel mini pool or welded rear ends only. Steel axles only. One piece
drive flange only. No torque dividing differentials. No scalloped ring gears.
Steel tube quick change rear ends are allowed. Steel axle tubes only. Minimum 10” ring gear only. No titanium, no
aluminum birdcages, and no wide five hubs. *Quick Change rear ends are optional not mandatory. Aluminum spools,
brackets and pinion covers are OK.
10. BUMPERS/RUB RAILS
Steel only. Bumpers must be used both front and rear at all times and welded, or mounted with bolts. Must be
minimum 1.25 inch O.D. tubing. .065 wall thickness on front. .095 wall thickness on rear. Two-bar front bumpers 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. Rear bumper
and nerf bars can be no wider than tires with no sharp edges on either end.
11. TIRES AND WHEELS
Must run Hoosier G60, American Racer G-60 or McCreary G-60. Any 8” steel wheel.
12. 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 patterns may be changed. Larger studs allowed. Rear rotors may be
aftermarket, minimum 0.810 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.
13. EXHAUST
Round tube headers only. All primary header tubes must enter directly into one collector at some point at end of header
and point rearward.
14. FUEL SYSTEM
Racing fuel cell required, maximum 32 gallon capacity, must be in minimum 18 guage steel container. Cell must be
securely mounted behind rear axle, between tires, minimum of four inches ahead of bumper, minimum of ten inches
above ground. Must mount with minimum two .125 inch thick solid steel straps, two inches wide around entire cell. 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 must have check valves. Pick-up
must be on top or right side of cell. Limit one fuel filter. No cool caps. If fuel cell does not have aircraft style
positive seal filler neck/cap system, a flapper, spring or ball type rollover valve is required.
(a) One naturally aspirated 2 or 4 barrel carburetor only. No adjustable carb spacers.
15. FUEL
Gasoline or alcohol. No performance enhancing additives. Upper cylinder lube allowed. Fuel sample may be taken
from car at any time.
16. BATTERY/STARTER
One battery only. Must be shielded and securely mounted between frame rails. 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.
17. GUAGES/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. Only 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 electronic traction control devices.
18. TRANSMISSION/DRIVESHAFT
Must have at least one gear forward and one reverse, plus a neutral position. With motor running and car in a still
position, driver must be able to engage car in gear and move forward, then backward. Layne, Ernie Glide, Bert and
Brinn transmissions will be allowed as well as any OEM transmission. No five speed transmission, “ in or out” boxes, or
quick change devices allowed. Functioning shifter must be in stock location on transmissions manufactured after 1995.
All manual gear-type transmissions must have a standard OEM case and must have a working disc-type or approved
cone-type clutch inside and explosion proof steel bellhousing. Automatic transmissions must remain in OEM stock
apperaring automatic case. Original bellhousing must remain. Must have an approved scatter shield or blanket.
Scattershield may be constructed of 25-inch by three-inch steel, 270 degrees around flexplate or flywheel.
No Brinn-Pro Series Transmission or Bert Ball Spline Transmissions.
19. 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 2 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.
20. ENGINE SPECIFICATIONS Any American make engine allowed. Steel heads, block and oil pan only. All engines must be able to be used in conventional passenger car without alteration. Engine mounts cannot be removed or altered. Castings and fittings must not be changed. No machine work on outside of engine. “Wet” oiling sytem only. 21. WEIGHT Minimum weight limit of 2,450 lbs, no tolerance, after race with driver. Weights must not be used in driver’s compartment or outside of the body or hood area. Any weights added to other areas of vehicles must be securely mounted and must be painted white and have the car number on it, and 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. 22. ASPIRATION One two-barrel or one four-barrel carburetor OK. Must be naturally aspirated. No fuel injection. No electric fuel pumps.