2017 Street Stock Official Car Specifications
TERMS: The term "Stock O.E.M. replacement” means that the item/part must have
been a standard item/part on the MAKE and MODEL of the vehicle being driven as a
racecar. Just because the company that manufactured the vehicle manufactures a
part does NOT mean the part is legal. The part must have been available on the
specific vehicle being used as a racecar. Stock O.E.M. replacement direct fit,
direct replacement part. Must meet size/weight/material requirements as if
factory produced. No Modifications.
The term Factory Stock/Production or Factory Produced:
Manufactured by the company who produced the vehicle being used as a racecar.
Manufactured for the year/make/model of the racecar. No aftermarket parts
REMEMBER – BUILD IT LEGAL, KEEP IT LEGAL AND HAVE FUN!
In the spirit of equalizing competition, adjustments may be made as becomes
1.0 - STREET STOCK COMPETING MODELS
1.1- Competition is open to all North American made passenger cars. No
1.2 - Minimum factory wheelbase of 100"
1.3 - No Jeeps, 4WD, SUV’s, station wagons, compacts, convertibles, full size
trucks, vans, front wheel drive
1.4 - Mid size trucks (S10, S15, Ranger and Dakota) are not allowed.
2.0 – APPEARANCE
2.1 - All cars must be neatly and brightly painted.
2.2 - Numbers should be as large as possible (opposite colour of background) on
doors, roof and all four corners of the body. (roof number must be read from
right hand side of the car) – may be asked to make adjustments to numbers at
2.3 - Sponsor decals must be placed on designated location.
2.4 - Year, Make and Model and Engine must appear in small print on the hood of
3.0 - BATTERY
3.1 - Battery must be securely fastened in trunk or under hood or behind the
3.2 - Positive terminal end to be insulated to prevent shorting (use of rubber
4.0 – BODY
4.1 - Must retain All Factory Stock appearance, location and dimensions.
4.2 – Stock roof must be steel and remain in stock location for the car’s make
and model year. Fenders, doors, trunk lid and quarter panels can be replaced
with minimum 0.040” aluminum.
4.3 – Any Stock Appearing fiberglass, aluminum, or plastic composite hoods will
be allowed. Maximum 3” raised cowl is allowed.
4.4 – No openings in hoods allowed.
4.5 - Body no lower than the frame rail.
4.6 - Altered bodylines will be significant reason for disqualification.
4.7 - Bodies must be attached and mounted in original stock factory location.
4.8 - No off setting bodies and must be centered on the chassis.
4.9 - The body may not be lowered on the frame.
4.10 - Windshield pillars and windshield angle must remain stock appearing.
4.11 - Headlight, parking, and taillights must be removed and neatly covered.
4.12 -Maximum 6" rear blade spoiler. No side pods or side supports allowed.
Stock spoiler allowed.
5.0 – Body Mounts
5.1 - Bracing must be welded or bolted to a minimum 2 locations to the frame,
two locations to the body.
6.0 – Bumpers
6.1 - Stock front and rear bumpers (rubber bumpers allowed) or fabricated
bumpers with stock appearing cover must be approved by official.
6.2 - A bar may be mounted inside the bumper at 19" from center to ground.
6.3 – All bumpers must be rolled in and securely fastened in place.
6.4 - Bumper shock brackets must be welded and or bolted.
6.5 - Aftermarket plastic front and tail pieces allowed but must be stock
6.6 - Corner bracing is allowed inside behind sheet metal.
7.0 – Doors
7.1 - Must be welded or bolted shut.
8.0 – Firewalls & Floor
8.1- Car must retain stock front steel firewall in original location and must be
sealed to the hood.
8.1.1- Fabricated firewalls in stock location will be allowed but must be the
same weight as stock firewall. Must meet technical director(s) satisfaction.
*8.2.2 - Fabricated steel firewall up to 6" setback from stock location well
be allowed with a 20 lb. Penalty secured to the right front frame rail in the
firewall area. Placement of penalty weight must be approved by Technical
Director. Penalty weight must be removable to be weighed by Tech.
*8.2 - Stock mounted brake pedals mounted in stock location. (Pedals may be
extended) Any other arrangement must be approved by Technical Director
8.3 - Sheet metal may be added to repair firewall mounted in original
8.4 - Floor must be stock or replaced with a minimum 20 gauge steel. Right side
may be raised 12" for exhaust clearance.
8.5 - Rear firewall must be completely sealed off from drivers compartment
minimum 20 gauge steel
8.6 - Trunk floor may be removed.
9.0 – Frames and Suspension
9.1 - Frames
9.1.1 - All frames must retain all Factory Stock specifications and dimensions
for make and model from front to rear. Wheelbase tolerance +/- 1” from stock.
9.1.2 - Rusted out rear clips may be reinforced from rear-end back.
9.1.3 - Unibody cars may tie sub frames together.
9.1.4 - Sub frames may be tied together but must be symmetrical to the
centerline of the car.
9.1.5 - "X"ing of frames allowed.
9.2 – Suspension
9.2.1 - Front and rear suspension must be stock dimensions.
9.2.2 -Front upper control arms may be replaced with tubular arms with bolt in
stock ball joint or AFCO 20032-1, TRW 10269, Moog K6136, ALL56208, Metric cars
8"-8 ½", ’73-‘77 GM and '70-'81 Camaro – Firebird 9"-9 ½" measured center of
shaft to center of ball joint. All other cars stock length. Steel shaft only,
caster slugs and slotted shafts allowed.
9.2.3 - Thicker lower ball joints allowed, spindle must be in stock location.
9.2.4 - Rear control arms may be fabricated to +/- 1" from stock dimensions or
stock arms may be reinforced. Adjustable upper arms allowed.
9.2.5 - Steel caster camber plates allowed on strut cars.
9.2.6 - Any steel springs allowed must be stock coil diameter.
9.2.7 - Cut springs allowed.
9.2.8 - The use of twist in ties or rubber spacers are allowed between the
9.2.9 - Adjustable spacers or load bolts allowed above or below rear coils.
9.2.10 - Adjustable or solid spacers allowed above or below front springs
9.2.11 - Rear shackles must be no longer than 6". (Multi-bolt holes allowed).
9.2.12 - Lowering blocks allowed 2" Max.
9.2.13 - The use of aftermarket bushings allowed
10.0 – Glass and Trim
10.1 - All glass and plastic must be removed. This includes all chrome, lights,
mirrors, reflectors and trim.
11.0 – Hood and Trunk Lid
11.1 - All hood and trunk lid must remain on car at all times.
11.2 - All hoods and trunk lid in stock position and properly sealed from
11.3 - All hoods and trunk lid must be securely fastened.
11.4 – No holes in the hood for the air cleaner
12.0 – Interior
12.1 - All knobs, handles, decks, unnecessary upholstery and seats must be
12.2 - No rearview mirrors are allowed inside or outside of the car.
13.0 – Roll Cage
13.1 - No offset cages.
13.2 - A roll cage is mandatory and must consist of a minimum six-point roll
cage with approved driver protection.
13.3 - Roll cages must be welded directly to the frame.
13.4 - Roll cages must be constructed of steel tubing 1-1/2" O.D. x .120 " wall
thickness or 1-3/4" x.095" wall thickness.
13.5 - No extra bracing on outside of car allowed.
13.6 - Three (3) horizontal bars minimum running between the front and rear
upright bracing are required on the driver’s side and must bow outward (not
including the frame)
13.7 - Passenger side must have a minimum of (3) horizontal bars running between
front and rear upright or a X with a top straight bar (not including the frame)
13.8 - Front center windshield post minimum 1-1/4"x.120 mandatory.
13.9 - Upper roll cage must have center roof bar. 1-3/4" x .095 minimum or 1-1/2
"x .120 minimum.
13.10 - Main roll bar must be symmetrical to driveshaft.
13.11 - All roll bars in driver’s immediate area must be padded.
14.0 – Rub rails
14.1 - One rub rail allowed on each side and maximum 1" by 2" rectangular tubing
mounted tight to the door panel only.
14.2 - Must have ends beveled.
14.3 - No sharp edges.
15.0 – Steering Column
15.1 - Steering Column must be in original position for make and model. Stock
style collapsible steering column.
15.2 - Steering quickener allowed.
16.0 – Tow Hooks
16.1 - Front and rear tow hooks are required.
17.0 – Windshield
17.1 - All glass removed. Windshield must be replaced Lexan or full screening.
1" square maximum.
17.2 - Window screen must cover the entire windshield area. (From door post to
18.0 – Air Cleaners
18.1 - Aftermarket air cleaners may be used.
18.2 - Air cleaners may not extend beyond the hood.
19.0 – Air Filter
19.1 – ONE round type air filter element maintaining a minimum of 4 inches and a
maximum of 14 inches in diameter will be permitted.
19.2 - K&N style filters will be allowed.
19.3 - No special air cleaner top or bottoms that direct air into the
19.4 – No plastic air cleaner’s tops or bottoms (metal only).
19.5 – All air shall be filtered through the filter element.
19.6 - No carburetor inserts to direct air into the carburetor.
19.7 - No air boxes, hoses, or any device that directs air into the air cleaner.
19.8 - No ram air.
20.0 – Brakes
20.1 - Shut-off valves on any brake line are NOT permitted.
20.2 - No rear disc brakes allowed. With the exception of factory equipped
20.3 - All cars must have OEM working brakes at all times.
21.0 – Drive Train Requirements
21.1 - Only stock manufactured 3 speed or 4 speed automatic OD transmissions are
permitted. No alterations.
21.2 - 2 speed Powerglide will be allowed only with 150lbs. added to minimum
21.3 - Stock standard transmission or 2 speed Powerglide allowed with no weight
penalty if engine is 305 cubic inch. + 0.060" overbore or less.
21.4 - No light weight flywheels, pressure plates or disks. OEM only.
21.5 - Bell housing can be a steel racing type. If a stock aluminum bell housing
is used it must have a scatter shield.
21.6 - Must have all operational forward and reverse gears.
21.7 - Functional stock unaltered V8 OEM torque converter only. Minimum weight
36 lbs. full of oil. Cannot be modified to reduce weight. Must be stock stall,
no lower "positive lock up" stall speed. Track can claim torque converter for
$250 to have cut open for inspection. $250 will only be paid if converter is
21.8 - Transmission coolers are allowed, only in trunk or engine compartment.
21.9 - Drive Shaft must be steel OEM type.
21.10 - Drive Shafts must be painted white.
21.11 - One front 360 degree drive shaft hoop (mounted towards front half of
driveshaft) from 1" x .095" tubing is mandatory.
21.12 - Rear end must be same as make, model of chassis being used.
21.13 - Rear end may be locked by welding spiders or using steel mini spool.
21.14 - Leaf spring perches on rear end can be changed to allow for pinion angle
adjustment. Rear end must be centered in car.
*21.15 - Any gears can be used 4.30:1 or numerically lower.(i.e. 2.41:1 -
4:30:1) If engine is 305 cubic inch or lower +0.060" overbore any gear ratio may
be used for stock make and model of axle.
21.16 - Racing wheel studs are mandatory.
22.0 – Electrical System
22.1 - The self-starter must be in working order and located in stock position.
22.2 - Only standard factory OEM type production starters permitted. All cars
must start under their own power.
22.3 - STOCK OEM HEI Distributor. No aftermarket coils or modules.
23.0 – Exhaust System
23.1 - Unaltered stock cast iron exhaust manifold only allowed or factory built
steel street style headers are permitted. Primary pipes maximum 1 5/8" OD to
23.2 - Mufflers are mandatory if headers are used. Must be an unaltered OEM or
unaltered street style muffler. No glass pack type muffler or "cherry bomb"
23.3 - Mufflers are recommended with cast manifolds.
23.4 - Maximum exhaust pipe diameter 3" OD round with cast manifolds. Maximum 2
1/2" OD round with headers. No oval or square.
23.5 - Pipe must run under floorboard and exit behind the driver.
23.6 - No center dump manifolds
23.7 - No "H" or "X" pipes.
23.8 - Exhaust must be secure. Muffler must have two hangers. If muffler or
exhaust falls off during a race the car may be penalized.
24.0 – Fuel Pumps
24.1 - Mechanical fuel pump only.
24.2 - No electric or belt driven fuel pump allowed.
24.3 - Engines converted from fuel injected, electric pumps will be allowed,must
have oil pressure shut off.
25.0 – Fuel
25.1 - Pump gas highly recommended. No additives.
26.0 – Fuel Cell
26.1 - Stock gas tank must be removed and replaced with a mandatory fuel cell.
26.2 - Fuel Cell shall be securely mounted in the trunk area with a minimum of
two straps of 1/8" x 1" steel.
26.3 - Fuel Cell to be no lower than lowest part of frame section or be fully
protected by a minimum of 1-1/2" tube.
26.4 - No stock location tanks allowed. 26.5 - No aluminum tanks allowed.
26.6 - All caps, fittings and lines must be secure, leak proof and of high
26.7 - Fuel line from trunk to engine must be one continuous line securely
fastened under floorboard and attached to frame rail.
26.8 - Trunk must have to be opened to refuel.
26.9 - No sloppy installations.
26.10- Filler neck must be grounded
27.0 – Radio
27.1 - No two way radios are allowed.
27.2 - A working one way radio is mandatory.
27.3 - Frequency is 454.000.
27.4 - RACECEIVER One way radios are recommended.
*27.5 - No mobile devices allowed in cars during competition.
28.0 – Radiator
28.1 - Racing aluminum radiators or stock aluminum radiators allowed.
28.2 - No electric pumps.
28.3 - Radiator must remain in front of the engine in the stock position.
28.4 - Racing fans and electric fans allowed. Metal flex fans are not permitted.
29.0 – Safety
29.1 - Entrants must wear an SFI 3.2A -1 or better fire retardant racing suit.
29.2 - Entrants must wear a proper fitting full-faced 2005 SNELL SA or newer
–approved racing helmet with proper identification, and have no signs of
previous damage. No open face helmets allowed.
29.3 - Fireproof gloves SFI 3.3/1 mandatory.
29.4 – Fireproof footwear, neckbrace or Hans/Neck Gen are strongly recommended.
29.5 - Helmet is recommended to be worn at all times when the vehicle is in
30.0– Seat Belts
30.1 - One 3" inch wide SFI –approved lap, two belts over the shoulder and one
submarine strap mandatory.
30.2 - Both ends of lap belts must be securely fastened to the frame and roll
cage with high quality bolts, not less than 7/16 inch in diameter. 1/2" inch
30.3 - No frayed or torn belts.
30.4 - It is recommended that seatbelts are no more than 3 years old.
31.0 – Seat
31.1 - Seat must be an aftermarket aluminum high back-racing seat. No fiberglass
31.2 - Seat must be securely fastened in six spots, Four (4) bolts on bottom and
two (2) bolts on seat back.
31.3 - Seat must be securely fastened to frame and cage.
31.4 - No floorboard installations allowed.
31.5 - The seat must be positioned to the left of the center of the car.
31.6 - All bars and sharp contact areas around driver must be padded.
32.0 – Shocks & Struts
32.1 - Steel shocks or struts only.
32.2 - One steel shock or strut mounted in stock location. One per wheel.
32.3 - Steel bodied shocks only. Adjustable click style shocks allowed.
Non-rebuild able shocks. Shock extensions allowed. Shocks not to retail more
than $150.00 CDN
32.4 - Struts not to exceed Retail of $300.00 CDN.
33.0 – Tires
33.1 - Cars running SPEC, GM Crate part # 88958602, #19258602 or 305 cubic inch
or less engine +0.060" overbore allowed
Hoosier 8" spec tires or
American Racer 8” soft, med hard spec tires (“F” tread pattern only). These
tires may be mixed and matched.
*33.2 – Sipping, grinding and grooving of tires Allowed.
33.3 - Maximum radial tire size P235 with 8"tread. DOT numbers and tire
stampings must be visible.
33.4 - No snow or ice tires allowed.
34.0 – Steering Wheel
34.1 - The steering wheel center must be padded.
34.2 - Minimum size of steering wheel 12 "diameter.
35.0 – Weight
35.1 - All must weigh a minimum of 3000 pounds after the event with driver.
35.1.1 – Maximum 55% left side weight.
35.1.2 – Maximum 49 % rear weight for Four (4) control arm suspension cars.
35.1.3 – Maximum 47% rear weight for all other types of rear suspensions.
35.2 – Driver must have belts tight when checking %. Removal of mud will be at
the discretion of the technical director(s).
35.3 - Any additional weight must be securely fastened with two, minimum
½"diameter, grade 8 bolts.
35.4 - Weight in the driver’s compartment must be approved by tech official
35.5 - Added weight must be painted white with the car number painted, engraved,
or stamped on each piece.
35.6 - It is recommended that extra roll cage and driver protection be
considered for reaching legal weight.
36.0 – Water Pump & Pulleys
36.1 - OEM replacement water pump only. No Chevy aluminum pumps.
36.2 - The use of aftermarket pulleys will be allowed to assist over-heating
37.0 – Wheels
37.1 - Steel racing type wheels allowed.
37.2 - Maximum steel wheel width of eight (8) inches.
37.3 – Minimum Three (3) inch and Four (4) inch back spacing. Tires must not
stick out past body or rub rails.
37.4 - 1/2 inch studs, minimum, are mandatory on all four wheels.
37.5 - Must have one (1) inch lugs.
37.6 - A wheel spacer up to a ½" on right rear is allowed.
37.7 - BEADLOCK rims allowed.
37.8 - Foam only wheel plugs are allowed. NO DZUS TAB or expandable mounting
bead lock covers allowed
38.0 – Window Nets
38.1 - Racing window nets are mandatory on driver’s side of car.
38.2 - Window net to be mounted so quick release latch is at top front of
39.0 –Spec. Engine Rules
39.0.1 - Engines must be mounted in stock location.
39.0.2 - All engine blocks must be standard factory production passenger block.
39.0.3 - Engine block and component parts must retain all standard stock
external and internal dimensions.
39.0.4 - No aftermarket or aluminum blocks.
39.0.5 - Zero deck allowed on blocks with maximum .060 overbore allowed.
39.0.6 - Internal polishing of the engine block is not permitted.
39.0.7 - Chevrolet –350 CID, Ford-351CID, Chrysler -360 CID allowed.
39.0.8 - Stock hardware on engines.
39.0.9 - Factory production unaltered replacement three ring, four eyebrow flat
top aluminum pistons allowed. No modifications.
39.0.10 - Only Factory production or OEM standard steel piston pins may be used.
39.0.11 - Only Factory production steel connecting rods permitted.
39.0.12 - All rods must maintain the standard stock rod length for engine block
39.0.13 - No Oldsmobile Rods.
39.0.14 - No modifications of any kind.
39.0.15 - Any steel oil pan.
39.0.16 - No oil coolers allowed.
39.0.17 - No accusumps or external oil pumps allowed.
39.1 – Spec. Carburetor
39.1.1 - Holley R4412 that MUST REMAIN BOX STOCK.
39.1.2 - Carburetor must be mounted parallel to intake.
39.1.3 - Track Officials reserve the right to and will exchange any competitor's
carburetor at any time.
39.1.4 - Choke may be removed, throttle shaft may be welded, jets and power
valves may be changed.
39.1.5 - One- BRP 377 adapter mandatory.
39.1.6 - Two .030 Gaskets only.
39.1.7 - Throttle Shafts must remain standard and must not be thinned, cut or
altered. No modifications.
39.1.8 - No air induction plastic inserts or other devices to direct air to
39.2 – Spec. Cylinder Head
39.2.1 - Re: CHEV 350 - GM STRAIGHT PLUG CAST IRON HEADS ONLY. NO CAMEL BACKS;
VORTEC; or DART PERFORMANCE HEADS.
39.2.2 - Identification and part numbers must remain on the part being used with
39.2.3 - Any attempt to alter, change, or eliminate part numbers will result in
that part’s ineligibility.
39.2.4 - Maximum intake port of 160cc. and maximum exhaust port of 60 cc. with
minimum 74 cc. combustion chamber.
39.2.5 - No internal grinding except valve seats. All cutting in reference to
the valve job must be centered off of the centerline of the valve guide. Upon
completion of the valve job, the bowl area under the valve seat down to the
bottom of the valve guide must still be the same configuration as far as shape
and size as it was from the manufacturer. Must retain same configuration.
39.2.6 - No work below valves.
39.2.7 - Screw in studs, guide plates and poly locks allowed.
39.2.8 - Chev maximum valve size - INTAKE 1.94 - EXHAUST 1.50.
39.2.9 - Ford and Chrysler stock valve size for head.
39.2.10 - Stainless steel exhaust valves allowed. No neck down valves, No
39.2.11 - No bronze guides, but bronze liners allowed.
39.2.12 - Minimum head gasket thickness .040.
39.2.13 - Stock diameter single valve springs and retainers only.
39.2.14 - No dual valve springs.
39.3 – Spec. Crankshaft & Harmonic Balancer
39.3.1 - Only factory production cast iron crankshafts with no other
modifications of any kind except minimum .030 under size. Chev Part # 3932442 or
39.3.2 - Drilling for balancing only.
39.3.3 - Must remain stock stroke.
39.3.4 - Knife-edging, polishing, undercutting, and lightening is not permitted.
39.3.5 - Factory production or OEM replacement harmonic balancers are permitted.
39.4 – Spec. Camshaft & Timing Chain
39.4.1 - Hydraulic camshaft only.
39.4.2 - Not to exceed .450 lift on intake and exhaust with stock diameter
39.4.3 - No roller cams allowed.
39.4.4 - No mushroom cams allowed.
39.4.5 - No gear or belt driven cams.
39.4.6 - Timing chain and gear may be of a roller type or OEM replacement chain
39.4.7 - Lifter valley baffles allowed.
39.5 – Spec. Exhaust Manifold
39.5.1 - Stock cast iron exhaust manifold must be used (unaltered) – no center
*39.5.2 - Factory built street style headers are permitted. Primary pipes 1 5/8"
OD to maximum 3" collector.
39.6 – Spec. Rocker Arms
39.6.1 - Stock ratio stamped steel rockers arms only.(Chev. 1.5)
39.6.2 - No roller tip or roller rockers.
39.7 – Spec. Intake Manifold
39.7.1 - Only an aluminum four barrel intake as cast box stock with no
modifications or grinding permitted.
39.7.2 - Manufacturers and part numbers that are legal are as follows:
Wieland X – Celerator, Chevy # 7547, Ford # 7515,
Edelbrock Torker II Chevy # 5001, Ford # 5021, Chrysler #5076.
Edelbrock Performer Chevy #2101, Ford #2750 or #2181, Chrysler #2176
39.8 – Spec. Push Rods & Valve Springs
39.8.1 - Stock length and diameter push rods.
Chev.350 1.260 diameter spring with installed height of 1.70-1.75
Ford 351 1.500 diameter spring with installed height of 1.82
Chrysler 360 1.500 diameter spring with installed height of 1.65
The engine owner will be responsible for any and all costs incurred in the tech
inspection of this engine however, any Car required to remove their Head(s)
and/or Pan by Humberstone Speedway Technical Inspection and found to be “legal”
will be reimbursed $50 for costs of replacing gaskets.
40.0 GM Circle Track Crate Engine Part # 88958602 or #19258602
40.0.1 - Must remain stock.
40.0.2 - ANY TAMPERING OR CHANGING OF ANY ENGINE PARTS WILL RESULT IN COMPETITOR
BEING DISQUALIFIED FROM EVENT, LOSS OF ALL POINTS TO DATE AND SUSPENDED FOR ONE
40.1 – Carburetor
40.1.1 - Holley R4412 that MUST REMAIN BOX STOCK.
40.1.2 - Choke may be removed, throttle shaft may be welded, jets and power
valves may be changed.
40.1.3 - Carburetor must be mounted parallel to intake.
40.1.4 - Track Officials reserve the right to exchange any competitor's
carburetor at any time.
40.1.5 - One BRP 377 adapter only.
40.1.6 - Two .030 gaskets only.
40.1.7 - Throttle shafts must remain standard and must not be thinned, cut or
altered. No modifications.
40.1.8 - No air induction inserts or other devices to direct air to intake.
41.0 – Non Spec Engine - (RADIAL TIRES ONLY)
41.0.1 - Must be in stock location.
41.0.2 - Maximum engine size:
Ford 351 (no Boss or Cleveland)
41.0.3 - Any engine under 318 CID must be 1976 or newer.
41.0.4 - Must be stock stroke, 0.060" overbore.
41.0.5 - Engine must be same make as chassis (GM engine in GM car).
41.0.6 - Factory blocks with factory dimensions except 0.060" overbore.
41.0.7 - No aftermarket or aluminum blocks.
41.0.8 - Minimum deck height 0.020" with steel gasket or zero deck height with
41.0.9 - Internal block painting, screens and plugs allowed.
41.0.10 - Lifter valley baffles allowed.
41.0.11 - Rods must be stock length. (Chev.350 5.7") steel only. No light
41.1 – Intake Manifold
41.1.1 - An aluminum four barrel intake as cast box stock with no modifications
or grinding permitted.
41.1.2 - Manufacturers and part numbers that are legal are as follows:
Wieand X - Celerator, Chevrolet - part # 7547, Ford - part # 7515, Chrysler -
part # 7545
Edelbrock Torker II, Chevrolet - part # 5001, Ford part # 5021, Chrysler part #
Edelbrock Performer Series, GM #2101,#2104,#2116,#3704 Ford #2750,
OEM 2 or 4 barrel dual plane intake with no modifications.
41.2 – Pistons
41.2.1 - All engines must use stock type OEM flat top pistons with full skirt.
41.2.2 - No light weight pistons
41.3 – Carburetor
41.3.1 - Holley manufactured 2 barrel # R4412 carburetor permitted with no
modifications box stock only except choke plate removed and jet changes.
41.3.2 - Or any OEM production 2 barrel carburetor (max. 1-3/8" venturi) may be
used. No modifications except jet changes and choke plate removed.
41.3.3 - One 1 inch thick nonadjustable adapter approved by official.
41.3.4 - Two .030 gaskets only.
41.3.5 - No air induction
41.3.6 - No carburetor inserts or other devices to direct air into intake.
41.3.7 - Stock type air breather mounted parallel to intake.
41.4 – Cylinder Heads
41.4.1 - Screw in studs and guide plates allowed.
41.4.2 - No high performance heads.
41.4.3 - OEM stock type valves.
41.4.4 - No work below valve seats.
41.4.5 - Chev. max. valve size - intake 1.94 - exhaust 1.50.
41.4.6 -Stock diameter single valve springs and retainers only.
41.4.7 - Ford and Chrysler stock valve size for head.
41.4.8 - Stock length pushrods.
41.4.9 - OEM type stamped steel rocker arms Chev 1.5 ratio only.
41.4.10 - No roller or roller tip rocker arms.
41.4.11 - 350 Chev 72 cc minimum combustion chamber.
41.4.12 – 350 Chev approved head numbers-014, 126, 195, 267, 330, 336, 339, 388,
393, 441, 445, 454, 487, 493, 545, 598, 624, 642, 709, 799, 813, 862, 881, 882,
920, 991, 997.
41.4.13 - Vortec heads allowed on 305 CID engines only.
41.4.14 - Ford 302 CID and Chev 305 CID heads must be 1976 or newer.
41.4.15 - No 305 heads on 350.
41.5 – Camshaft
41.5.1 - Any hydraulic camshaft may be used not to exceed .450 lift on intake or
exhaust at the valve with stock type hydraulic valve lifters.
41.5.2 - No roller lifters.
41.5.3 - Engines under 305 CID + 0.060"overbore allowed stock type roller
hydraulic valve lifters.
41.6 – Oil Pan
41.6.1 - Optional viewing window can be installed in the oil pan.
41.6.2 - Any oil pan may be used.
42.0 – Technical Inspection
Humberstone Speedway reserve the right to perform technical inspection on and
car at any time.
42.1 - All new cars must arrive at the track one hour prior to start time and
report to the tech inspector.
42.2 - If car does not meet our rules it will not be able to compete. No
42.3 - All cars are subject to inspection by Humberstone Speedway officials at
any time and in any manner determined by track officials. All decisions
regarding the timing and manner of the inspections, as well as which cars will
be inspected, are final.
42.4 – Humberstone Speedway reserves the right to confiscate any illegal
components at any time as deemed necessary.
42.5 – Humberstone Speedway reserves the right to impound any car for any reason
at any time.
43.0 – Post Race Technical Inspection
43.1 –Post Race Technical Inspection is carried out within the confines of the
Tech Area will be completed under the following guideline:
43.2 – Cars to be inspected MUST proceed immediately to the Tech Inspection area
after exiting the race track;
43.3 – No team members are allowed to touch or remove any part of the race car
without receiving prior approval of the HEAD TECH OFFICIAL; (remember the Taped
off / barriered area is RESTRICTED
43.4 – Cars (with Driver) must enter the tech area as instructed by inspectors.
Drivers must be move their racecar onto scales or be assisted by track officials
only if needed;
Access in the tech area will be restricted to the car driver and two crew
The team is responsible for preparing only the area(s) of the race car for
inspection as requested by the Head tech official in a timely manner;
Any participant (team) who refuses to allow tech officials to inspect their car
at any time or follow inspection directions and procedures will be subject to
Immediate disqualification from the event.
Loss of points and prize money for that event.
Credited with a feature win for handicapping purposes (if applicable).
Participants found to be illegal and disqualified during technical inspection
may be subject to the following:
Disqualification from the event.
Loss of points and prize money for that event.
Credited with a feature win for handicapping purposes (if applicable).
If found illegal on a double feature night, the car will be declared illegal for
both races and will not receive points or prize money for either.
A second infraction for deemed illegal or technical issues may result in the
Disqualification from the event.
Loss of points and prize money for that event.
Total Loss of all accumulated points to date. (Attendance record will not be
affected for year-end perfect attendance award)
Merrittville Speedway and Ohsweken Speedway cars will be allowed to compete
running home track rules.
CONTACTS: Humberstone Speedway
General Manager - Bob Davidson Phone # 905-834-4002 Email
Tech Director - Glen Hils Email firstname.lastname@example.org