Boyd Raceway Factory Stock Rules 2025
1.BODY: Any American made stock passenger car body on the stock unaltered full frame, Gm on Gm, ford on ford Chrysler on Chrysler no mixing. Stock appearing aftermarket plastic nose
piece is allowed, no adding additional material to nose, can be drilled for air but may not be
extended with any type of material. Tail pieces allowed. Rear of car must be sealed off, no
exposed fuel cell. No spoilers, wings, air scoops, Bodies cannot be moved from the original
body mount rubber bushing no more than +/- 1” cannot be less than 5 ½” from ground. A front
visor is allowed on the windshield area MAX 7 inches. No side or rear window visors allowed.
Sunroofs and T-tops must be reinforced and enclosed. No nerf bars. Maximum one inch wide
by two-inch-tall steel or lexan rub rails allowed - bolted flush to body. All glass, plastic,
upholstery, lights, mirrors, and trim must be removed. Cars must be stock appearing. No
excessive trimming of fenders or hoods allowed, no drilled holes allowed in hoods for air
supply, must maintain stock OEM appearance. All doors, fenders, and window openings must
remain stock appearing and OEM dimensions and be the same on both sides. Firewall must be
full and complete and no further back than oval hole, must be made from 18-gauge steel, must
be a minimum of 24” tall. Interior must be completely sealed off from engine, ground, and
trunk. Cars must have a complete stock OEM steel roof mounted in OEM location and OEM
rake and angle for model or OEM aftermarket fiberglass Shell valley part number F1015-81-
88MCRW is allowed. All openings should be covered as to isolate the driver, subject to track
approval. Race car body should be maintained in such a manner as to keep a presentable
appearance. Hood must have a minimum 54” opening centered over the frame. Trunk must
have a minimum 42” opening centered over the frame. Body must be mounted level with the
frame front to rear
2.FLOOR PAN: OEM floor pan may be cut 6” behind front OEM mounts in a straight line across
to the other side and be replaced using steel fabricated floor pans made of 18-gauge metal or
minimum of .049” thick steel securely welded to the frame. Must remain flat, OEM appearing
from frame rail to frame rail, no higher or lower than frame rail with the exception of a
maximum tall 8” drive shaft tunnel and similar to OEM tunnel in size. Interior must be
completely sealed off from engine, ground, and trunk.
3.FRAME: Frame must be full and complete. Cannot be Widened, Narrowed, Shortened,
Lengthened, or be Cut, Bent, or Altered to change Suspension Brackets. Rear of frame behind
upper shock mounts may be replaced with round, square, or rectangular tubing. Cannot
narrow right rear frame for tire clearance. No frame alterations allowed. All Bars forward of
cage must be lower than the hood. May not be cut for tie rod clearance or oil pan clearance.
4.BUMPERS: Stock type rear bumper required, or you may run a rear aftermarket bumper but
must run an aftermarket rear cover. A fabricated front bumper may be used with the following
conditions: cars with aftermarket nose pieces- the bumper may extend past frame rails for
support and reinforcement. Must be behind nosepieces. Cars without nosepieces- the bumper
may not extend past front frame horns. NO SHARP EDGES. Must have a minimum of 5/16th
diameter chain welded to front and rear of car with the design so tow truck can attach to them, this will be a DQable item. Rear fabricated bumper and stock rear bumper cars may have a 1-1/2” o.d. safety loop no wider than the factory fame and a maximum of 12” tall.
5.ROLL CAGE: Minimum four-point cage, minimum size 1 ½ “O. D. by .095” wall thickness.
Minimum three bars in driver’s side door, and two bars on passenger side door (three bars if
passenger in car) door plate from main loop to front edge of seat. Four-point quick release seat
belt and harness required for driver and passenger. Racing seats required. Must have window
nets door plate and fire-suit and gloves for driver and passenger. Must have at least three bars
in front of driver and passenger in windshield area. Window nets mandatory for both driver and
passenger must be properly installed no zip ties or hose clamps.
6.ENGINE option 1: Must be stock for the make and model except no 400’s or larger small or big blocks. Must use cast 4 equal valve relief flattop or dish pistons no gas ported pistons or rings, summit #sum-17360fc, speed pro-2256, icon #fhr ic-9913, diss #k8702-4000 is allowed. OEM crankshaft - cannot be lightened. No narrowing, bullnose, knife edge, undercut or drilling of
second or third rod throws, Scat SCT-9-10442 or eagle 103503480 is ok but cannot be lightened,
counterweights cannot be cut down, ground on or polished. OEM steel Connecting rods only
must remain stock OEM length, pressed pins only, weight and shape, Scat SCA 25700P or Eagle
EAGSIR5700BPLW is allowed, No lightening of any parts. Aftermarket water pump, mini starter, pulleys, okay steel harmonic balancer and steel oil pan only. Aftermarket power-steering pumps okay and must be belt driven. Metric cars may run a 350. NO stroking or de-stroking. Engine height and setback must be in stock location +/- 1”. GM metric frame center of fuel pump must be located a minimum of 1 ¾” in front of unaltered cross member. Solid motor and transmission mounts okay. No full mid plates. Maximum cranking compression 175lbs. (ignition off, engine turned over 5 compression strokes). Oil pans must have at least a 1” inspection hole with nothing inside of inspection hole blocking inspection scope from seeing rotating assembly. No alterations of stock oiling system. No vacuum pumps. No turbo or superchargers even if factory equipped.
7.CAMSHAFT, VALVETRAIN, AND CYLINDER HEADS: Hydraulic cam and flat tappet lifters only. 447 maximum lift at valve or .298 lobe lift at cam. Must maintain 14” of vacuum at 1200 rpm. 1.94 maximum intake valve diameter, 1.50 maximum exhaust valve diameter on Chevrolet engines. No hollow valve stems Stock size and shape valve springs and retainers, no titanium
parts. Stock length and diameter pushrods only. Stamped steel 1.5 rockers on Chevy, 1.6 on
Ford and Chrysler, NO roller tips. Aluminum rocker arm oil shields ok. Open chambered heads
only, must be unaltered, OEM NO porting, polishing, coating, no gasket matching allowed. The
only GM head numbers allowed are 14079267, 3986336, 3986339, 3986339X, 3986388,
3932441, 376445, 3928454, 3932454, 3876487, 3973487, 3973487X, 3973493, 3951598,
468642, 330862, 333882, 3998920, 3998991, 3998993, 3998997, and 3970126. Screw in studs
ok, guide plates ok. 305 engines may use 305 heads no vortec. Engine quest part number
CH350I and dart part number 10024360, dart part number 91624360 are allowed but must
remain as produced absolutely no casting removal below the valve seat or inside the intake
and exhaust runners or valve guide bosse. No unshrouded valves, all heads subject to cc test,
flat milling only.
8.ENGINE OPTION 2: Chevrolet Performance factory sealed CT350 Chevy small block crate
engine (Part #88958602 or #19258602 or #88869602). Must use a maximum 6200 rev limiter
mounted away from drivers reach and easily accessible for tech inspection.
A. Must utilize one (1) unaltered cast Holley 4412 two-barrel only with a maximum combined
total spacer, adapter of 1”, maximum of two 0.100 thick carb gaskets. Carburetors shall be
subject to claim.
B. Must be unaltered and sealed from factory at appropriate points (intake, head, timing
chain cover and oil pan) GM twist off bolt engines are not allowed. approved cables Chevrolet
performance cap seals and IMCA cable seals are allowed. Any altered, damaged or missing
cables will result in driver being disqualified from that event.
C. Only stock unaltered cast iron exhaust manifolds are permitted. Porting and/or grinding is
not allowed. Welding exhaust pipe to manifolds or modifying OEM exhaust flanges is not
allowed. Chevy center dump, Corvette, marine, LT1 or tubular steel-type manifolds is not
allowed. Adaptors between head and manifold are not allowed and must be able to use all
OEM exhaust bolt holes in head. Two- into-one exhaust and X-pipes No anti-reversion
exhaust, must use unaltered IMCA 609 mufflers one per side in good working condition no
leaks.
9.Carburetor and fuel system: Cast Holley 4412 2 barrel. no HP carbs or parts, must be
unaltered. NO L6R3250B CASTINGS ALLOWED. Casting number L6R199B IS ALLOWED BUT
MUST REMAIN as produced by the manufacture including metering plate #707, base plate and
bowl. NO screw in air bleeds, NO powder coating, or any modifications. Choke plate may be
removed. 4412 must be cast into choke horn of carb. Maximum spacer and adapter 1”
combined total and maximum of two 0.100 thick carb gaskets. NO fuel pressure regulators, NO fuel bypass systems, or any cool can devices. A shield from the top of radiator over the fan is allowed but may not go past the water neck housing and can’t be boxed in on the sides.
10.ENGINE OPTION 3: 4.8, 5.3 OR 6.0 GM LS with OEM pistons, Rods and crankshaft. Standard
bore blocks only. No boring cylinders. Racing oil pan okay. Stock exhaust manifolds only.
Cylinder Heads must be stock OEM. No porting or polishing. Untouched cylinder head.
Aftermarket valve springs okay. Must run 350 CFM Carburetor part #0-7448. Choke assembly may be removed. Air horn must be unaltered. Must pass tech tools. Any catalog mass produced aluminum intake manifold. No porting or polishing of intake runners. One electric fuel pump is allowed. Must run a fuel pressure safety switch. Must run MSD 6014CT Circle Track GM LS Engine Ignition Control. No other engine ignition control allowed. Rev Limiter must be set at 6200 RPM.
11.EXHAUST: Stock exhaust manifold for make and model or any header.
INTAKE MANIFOLD: Stock OEM unaltered aluminum or cast-iron intake only. No stock high
performance or high rise, No bowties. No porting, polishing, cutting or gasket matching, stock
unaltered Edelbrock 2701 and 2101 intakes allowed, absolutely no modifications allowed to
intake.
12.TRANSMISSIONS: Any stock type automatic or cast iron 3 speed OEM manual transmission.
No 4 or 5 speed transmissions. Automatics must have stock appearing working 10” torque
converter. Torque convertor must be steel. AFTERMARKET SFI ALUMINUM bellhousings on
automatic transmissions IS ALLOWED, aftermarket pan is allowed. Flexplate must be full,
unaltered OEM, or OEM replacement. No direct drives. All gears and planetary must remain
OEM type. Hardened input shaft is ok. Transmission Cooler ok. Manual must have single disc
10.5” clutch, flywheel and pressure plate must be steel, minimum 15lb steel flywheel. No
Aluminum bell housings on manual transmissions. No mini clutches. Steel drive shafts only
must be painted white and have a loop 6” from front u-joint factory mount, chain or flat strap
is ok.
13.FUEL: Pump or racing gas only. No methanol allowed. No additives or smells. Fuel cell must
be secured in trunk and have a minimum of 2” x 1.25 flat straps around it, no part of fuel cell
can be forward of any part of rear end. Fuel cell must be visible for inspection purposes from
the top through a removable stock appearing trunk lid.
14.SUSPENSION: Front and rear suspension must be stock unaltered OEM for that make and
model of frame, ball joints, spindles and all components, right front brake caliper may be
removed. Lower control arm bushings must be OEM design only and cannot be steel,
aluminum or grease able type. No air shocks. Lower A-Frame mount may not be notched for
clearance. No alterations to any part of the suspension or frame will be allowed. May run IMCA type upper a frame, ball joint must remain in the OEM location of a frame on upper control arms 8” or 8 ½” length only, must be left on left and right on right no flipping A frames over. Sway bars must be stock for make and model mounted in OEM mounts. No suspension stops of any kind and my not be touching and suspension stops or A-frame. Steel Shocks only must have OEM style stock type rubber ends, must be mounted in stock location. Cannot space shocks up or down, No bulb-type, threaded body, coil-over, or remote reservoir shocks. No external or internal bumpers or stops. No Schrader valves on shocks. All shocks must collapse completely at any time. Upper and lower trailing arms may be braced for strength.
15.SPRINGS: Maximum length of rear springs 14” tall free height and both sides must be equal
height and in stock location. 5” minimum diameter. No spring rubbers, no adjustable weight jacks of any kind, and must sit in unaltered top stock mounts. 110” plus wheelbase cars may
use 15” rear springs.no progressive Springs. Both front springs must be a minimum of 11” tall
with ½” tolerance.
16.BALL JOINTS: May run aftermarket ball joints but must be stock OEM dimensions. Rebuildable ball joints ok, May be bolted underneath top a-frame.
17.REAR END: Stock rear-end for make and model no modifying axle bearings or length May use
thick collar around axle seal area to prevent egg shaping. All brackets, control arms, and shock
mounts must be in stock location. All trailing arm bushings must be OEM or OEM replacement
with OEM design and No Alterations, no soft bushings allowed. Gears may be locked must use
stock unaltered ring gear carrier may weld or use bolt in locking blocks, No scalloped gears.
No full spools, Detroit lockers or torque sensing devices. Optional spring cups will be allowed
on rearend housing. Must be welded flat on the center line of the rearend and be in OEM
location. Rear end housings may be braced.
18.STEERING & SEAT: Steering boxes must remain in stock location. Aftermarket steering
wheel and quick release steering coupling are recommended. Quick steer boxes allowed. All
components must be steel, Unaltered OEM, in OEM location and match frame. Exceptions are
Tie Rod adjusting sleeve may be replaced with 5” steel tube, replacement spindle Speedway
Motors raised cast part number 91034501 allowed; bolt on OEM spindle savers allowed. No
part of driver seat may be no further back than 25” forward of center line of rear end housing.
No knobs, handles, or levers other than the gas pedal and brake pedal allowed for adjustment
of carburetor, ignition timing, or brakes.
19.RADIATOR: Any (1) radiator that fits in original location without any body modifications is
allowed. Water pump mounted fans only, no electric fans.
20.IGNITION: One 12-volt battery only must be mounted securely in rear of driver’s compartment or trunk area if in the drivers compartment battery must gel type only and be completely covered. No voltage generators in series with ignition system, voltage at distributor cannot be more than at battery (12) volts. One stock type distributor, module and coil in stock location only. Ignitions on/off switch must be clearly marked. No traction control devices of any kind. No digital gauges or taches. All cars must have a working transponder mounted on the passenger side firewall facing the ground, any car found without one will be given last place for that race.
21.BRAKES: May use dual aftermarket master cylinders and Aftermarket pedal OK, crank knobs
ok. Must have at least 3 working brakes. Right front may be blocked off, no brake gauges, no
electric or manual cut-off switches or valves allowed inside driver's compartment. Optional
one (1) manual brake shutoff valve allowed underneath the hood to the right front only. Disc
brakes allowed in rear No aluminum or composite rotors or calipers. Must use OEM steel stock
rotors on rear disc. No lighting or modifying of components.
22.TIRES AND WHEELS: 8” maximum wide wheels allowed, 15” diameter steel wheels only No
reinforcing wheels. Right rear 8” beed lock ok. Plastic Mud plugs and wheel covers allowed,
ONLY on the right side. Car Number must be on all Wheel Covers. Wheel cover must be plastic, be bolted, no Dzus fasteners, the ring that holds the wheel cover must be welded to the wheel
in at least three places. No bleed-off valves. Must run 1” steel lug nuts. Aluminum wheel
spacers only with a maximum thickness of 1-inch combined total per wheel. Approved
unaltered Hoosier asphalt F45 pull offs only. Must durometer 54 or higher WITHIN 15
MINUTES of checker flag, Subject to inspection any time before or after a race. No grooving,
siping, softening, needling, metal grinding disc, treating, softening, or wrapping in plastic
allowed. Deglazing with sandpaper disc ONLY allowed but cannot leave any grinding marks
and is subject to inspection before or after a race.
23.WEIGHT: Weight may be securely added in trunk or under the hood, but not in plain view or
within the driver’s compartment must be painted white with car number. Car must weigh
minimum 2900 lbs. with driver after race. No weight mounted to rear end housing or any
suspension Parts, all weight 25 lbs or less may use one ½” bolt, any weight over 25 lbs must
use two ½” bolts, no stacking of weight. All weight is subject to inspection, any car losing weight will be subject to disqualification.