PURE
STOCK RULES
ELIGIBILITY
REQUIREMENTS
The Pure Stock division at the
ENGINE
Any year engine may be run in any body, must be in model line
(i.e. Chevy/Chevy Ford/Ford, and so forth). Engine must remain in stock
location. All block and engine component (heads, intake, etc.) casting numbers
must remain. No notching frame for fuel pump
clearance. Cubic inch limit as follows: Chevy 350, Ford 351, Mopar 360, must have stock stroke and bore plus .030. Stock
type flat top piston - no domed. Stock cast-iron two-barrel intake only, no
after market allowed, no modifications allowed. Hydraulic or
solid cams only. Stock OEM Rockers & lifters only.
Roller tip, 1:5 ratio allowed. Hydraulic lifters only- no mushroom lifters, no
slotted rockers, polylocks allowed. Stainless steel
valves allowed. No Stud Girdles allowed. No Vortec
Heads allowed. No heads larger than 2.02 on all small block engines. No
adaptors. Stock OEM production cast iron. No porting, polishing, or grinding.
Heads must have internal and external measurements stock. No factory
performance cylinder heads. No Chevy angle plug heads. No Dart or World
Products heads.
NOTE: ENGINE RULES ARE DIRECTED AT THE CHEVY ENGINE. PLEASE
CHECK WITH TRACK OFFICIALS IF ANOTHER BRAND IS BEING CONSIDERED FOR
COMPETITION.
Gasoline only. No ignition timing
altering devices. OEM ignition systems only, (see
Super Stock ignition rules). Stock 2bbl. carburetor or optional Holley 4412
(see street stock carburetor rule). Hood scoops permitted. 3-inch
maximum height. Headers: May use chassis or crossover style headers.
Maximum 1 5/8 tube with 3 collector. No stepped, tri-y, or two into one systems. No 180 degree headers. No crossover or H-pipe
connectors. No crankcase evacuation systems. Mufflers recommended.
TRANSMISSION
Stock automatic or manual transmissions
only, with all gears working, including reverse. Automatic transmissions
must have functional 11‟‟ torque converter with no internal
modifications allowed. No hollow converters allowed or any method
of creating direct drive systems. Manual transmission, three or four
speeds only, must have full steel bell housing, stock clutch, pressure plate,
and flywheel. Minimum weight of flywheel is 25lbs. No aluminum parts
what-so-ever in clutch system. No aftermarket transmissions allowed. No
corvette parts allowed.
REAR END
Stock rear end only - Rear ends from different year cars will
be allowed but must remain same as manufacturer. Rear end must be locked,
spools allowed. 1 racing lug nuts mandatory on all wheels with ½ wheel studs
recommended. Drive shafts must be steel and painted white. All cars must have
full steel drive shaft safety hoop mounted not more than 6 from front U joint.
No chains or cables. All weights must be painted white with car number in dark
paint.
OPTIONAL: Nine inch Ford Rear
a. Maximum housing
width- drum to drum: 56in max.
b. Must utilize stock
GM mounts in stock OEM location on chassis
c. No light weight
(aluminum) parts. (Ex. Spool)
d. Flanged axles
only. No double spine axles
e. No floater type
housings.
SEAT
Aluminum racing seat mandatory. Must
be high backed, minimum of 0.095 material. Seat mounting (see street stock rule). Seat
location- stock OEM position.
BODY
Any American made sedan, 2 or 4 door. All cars must have
factory stock wheelbase. A minimum 1 tolerance will be allowed. No front wheel
drive cars. No sub compact cars. Full frame cars highly recommended. Outside
body must be complete. Cars may use aftermarket steel replacement panels, or aluminum, but each panel must retain OEM dimensions
and style. Straight panels, homemade, square-looking, or bodies resembling a
late model will not be allowed. Roofs may be fiberglass if they meet stock
dimensions. No aluminum roofs or roof parts. Inside door panel, inner fender,
trunk floor, and dash may be removed. Fenders can be cut 2 inches only for
wheel clearance. All glass must be removed. Windshield openings must be covered
with 1/2 square wire screen heavy gauge. Floorboards must be complete with all
holes patched from front firewall to rear firewall, from outside edge to
outside edge of frame rail. Passenger side floor can be removed, must be
replaced by either 20-gauge steel or .080 aluminum plate, from
center of hump to passenger side top door bar (must be no higher than straight
sloped NO LATE MODEL STYLE COCKPIT. Front firewall must be in stock location,
(can be replaced with 20 gauge steel or .080 aluminum plate) and rear firewall
and rear window shelf must be sealed off from driver's compartment with at
least 20-gauge steel, no holes. All doors must be welded or bolted shut. No
solid dark painted bodies will be allowed. All cars must look presentable. Seat
and steering column must remain in stock location (seat can not be located
further back than 32 from center of rear axle housing to the back bottom edge
of the seat, a 1 inspection hole must be provided in rear firewall at center
of seat back bottom location). No holes in the hood, 3 tall hood scoop allowed, non-functioning completely sealed. Window net is required
on drivers side. Gas pedals must have toe lift. No
cable linkage allowed. After market gas pedals recommended with toe lift.
ALUMINUM BODY RULES:
Aluminum bodies will be allowed as an
option. Considering the fact that teams may attempt to fabricate their own
bodies, the following rules are to be followed.
BODY:
1. Any car not
resembling the original body design will not be allowed to compete.
2. No Shoebox bodies.
3.
NOTE: Rules apply to exterior body
panels only.
ROOFS:
1. OEM Street or
aftermarket fiberglass replicas only.
2. No homemade steel,
aluminum, or fiberglass roofs.
3. Fiberglass roofs must
be of short track body dimensions and style. (See diagrams)
4. No late model,
modified, or IMCA roofs.
HOODS:
1. Aluminum (.040 or
.050) or steel must cover complete engine compartment.
2. Hood scoops allowed.
Maximum 3 inches tall and 21 inches in width.
3. Hood scoops must be
closed off with no external openings.
NOSE PIECE:
1. May be OEM or
aftermarket replica.
2. Must have nose piece.
3. Must fit body
correctly.
4. No late model type
flares.
FENDERS:
1. May be constructed
out of .040 or .050 aluminum. (.050 recommended)
2. Fenders must resemble
OEM fenders.
3. No late model flares.
4. Fenders must cover
90% of tire.
DOORS:
1. May be constructed
out of .040 or .050 aluminum. (.050 recommended)
2. Door must be original
dimensions (within reason)
3. Edges must be rolled
or broke for strength and form.
4. Must carry some sort
of body lines with fenders and quarter panel in middle of body.
5. No flat panels.
QUARTER PANELS:
1. May be constructed
out of .040 or .050 aluminum. (.050 recommended)
2. Panels must match OEM
original dimensions (within reason)
3. Edges must be rolled
or broke for strength and form.
4. Must carry some sort
of body lines with fenders and quarter panel in middle of body.
5. No flat panels.
6. Quarter panel must
extend 36 inches front centerline of differential to trailing edge of quarter
panel. (see diagram)
UPPER QUARTER PANEL:
1. May be constructed
out of .040 or .050 aluminum. (.050 recommended)
2. Panels must match OEM
original dimensions (within reason)
3. No solid panels.
4. Must have quarter
panel window cut in.
TRUNK LIDS:
1. May be constructed
out of .040 or .050 aluminum. (.050 recommended)
2. Must cover complete
rear section of car and be removable for inspection.
REAR PANEL:
1. May be constructed
out of .040 or .050 aluminum. (.050 recommended)
2. Panel must extend
quarter panel to quarter panel.
3. Panel must be a
minimum of 12 inches wide.
4. No screen or mesh
allowed.
5. Must be solid.
6. Aftermarket tail
piece recommended.
SPOILER:
1. May be aluminum or lexan.
2. Maximum height: 5
inches.
3. Spoiler side boards
may not exceed 5 inches in height or 6 inches in length and must not extend
beyond the main spoiler.
4. Must be tapered from
tallest point to lowest point equal on both sides.
5. Spoiler must be
non-adjustable.
COOLING SYSTEM:
OEM style radiator in stock location.
Must have one quart overflow tank. 22-pound radiator
cap recommended. Aluminum radiators allowed.
WHEELS
Maximum 8 wheel width. All four
wheels must be steel & same offset. Stock wheels must be reinforced. Racing
wheels recommended. Bead Locks allowed on right rear
only.
TIRES
American Racer size 70/245 x 15 only. No options. No recaps.
No softening of tires. Grooving, buffing, and siping
allowed. May run
diamond back or dot type tire non-racing tire.
FRONT SUSPENSION: Applies to GM
Metric Chassis only
A. Upper Control Arm:
May use stock, unaltered OEM A-frames or replacement steel cross shaft
aftermarket arms. Control arms must mount to stock OEM chassis mounts in
original location. Maximum length of the control arm: 8 ½ inches. Control arm
must use original type (metric) ball joint. May use stock or neoprene bushings.
B. Lower control arm:
OEM, stock control arms only. Must be mounted in original factory mounts.
Control arms or mounts can not be altered. May replace bushings with steel or
polyurethane aftermarket replacements. Must use OEM style metric ball joints.
C. Spindles: Stock OEM
only. No pinto or aftermarket dropped spindles. May not be reamed for larger
ball joint. Must utilize OEM wheel bearings. Spindle savers allowed.
D. Steering: Steering
box, tie rod end, adjusting sleeves, Idler arm, pitman arm, and drag link must
be in unaltered stock OEM parts for metric chassis. NOTE: May use aftermarket
adjusting sleeve, maximum 4 ½ inch length. Steel only.
E. Shocks: Front must be
original equipment design mounted in original mounts, upper and lower,
absolutely no aftermarket mounts. Aftermarket ahock
mounts allowed. No adjustable shocks. No aluminum shocks. No shocks with a
Schrader valve or remote reservoir.
F. Springs: OEM style
springs. Aftermarket springs allowed. No jacking bolts. Must be 5 ½ inches in
diameter. May be any length. Must fit into stock upper mount in frame and lower
control arm location. May use adjustable spring cups on top of springs only.
REAR SUSPENSION: The rear suspension must utilize all stock OEM mounting
points for metric chassis.
A. Trailing Arms: Must
use stock OEM upper and lower trailing arms. Lower arms must be stock length.
Upper arms may be altered for pinion angle. Positively no uniballs
or rod ends installed in trailing arm. May use polyurethane or steel
replacement bushings. Must attach to stock factory mounts in stock factory
location.
B. Springs: Upper seat
of spring must mount in stock position in factory crossmember.
Lower seat of spring must be mounted on top plain of rear end housing. May use
aftermarket weld on mounts. Spring may be of any length but with a minimum of 5
inches in diameter. May use adjustable spring cups.
C. Shocks: Must be
mounted in stock location for the type of rear end housing being used. Lower
mount of shock must be mounted in stock location. Upper mount of shock may use
an aftermarket or fabricated mount, but must be within 1 inch of original
location. May use fixed bearing shocks. No aluminum shocks. No shocks with a
Schrader valve or remote reservoir.
D. Frame: No excessively
rusted frames. Frames may be replaced from center line of rear axle to rear
bumper area. Must be constructed of rectangular tubing and properly braced.
ROLL BARS AND BRACING
Roll bars must be a complete 6-point bar, with 4 bars inside
driver's door. Bar minimum of 1 1/2 O.D. black steel pipe or seamless tubing of
0.095 thickness, all junctions must be gusseted. Also,
must have 1 bar down center of windshield of same dimension. No offset or set
back roll cages.
BUMPERS and NERFS
Nerf bars/rub rails: One external horizontal rub rail on each
side of the car between the wheels only is allowed. Must be
steel square tubing with a maximum dimension of 1 wide by 2 high.
Rails must mount flush against the body panels with each end cut at 45 degrees
and capped with no sharp edges; any exposed bolt must be a carriage type head.
Front Bumper - Stock type bumpers & covers only, no exposed tubular or 2x4
except for hoop. Rear bumper - stock type, stock type cover, or fabricated
steel, max. 4-inch height, cannot exceed 4-inches
beyond rear of body and filler. All rear bumpers must have lower quarter panel nerf (considered as part of bumper),
Lower quarter nerfs must be against body and extend a
minimum of 1-foot forward before turning and mandatory connecting to frame. All
bumpers cannot exceed being flush with sides. All Collapsible bumpers must be
welded so they will not pull apart. Bumpers must be securely fastened to the
frame. No visible reinforcement on bumpers. No cowcatchers. Front and rear
bumper hoops no higher than 8‟, no wider than the frame. Bracing allowed - two
braces per hoop, no larger than 1 1/2‟. May be
welded to frame behind bumper.
FUEL CELL
Fuel cells mounted in steel container mandatory. All fuel
cells must have tip-over valve in fuel cell or vent line. Maximum
22 gallon. Mounting instructions refer to Street Stock rules.
All cars must self-starting.
BRAKES
Operable and effective 4-wheel brakes mandatory at all times.
Three wheel brakes allowed, bur all components must be in place (rotor,
caliper, hose, etc). Dual Brake Master Cylinders allowed. Bias adjuster
allowed, NO REMOTE ADJUSTERS ALLOWED. Rear stock disc brakes allowed.
GENERAL
Heat may be run at the discretion of the promoter. A feature
event will be run.
Up to 24 cars will qualify for feature event. Any car causing unnecessary delays in the racing program will be disqualified. This rule will be enforced.
IMPORTANT NOTICE.
RACE
TRACK OFFICIALS RESERVE THE RIGHT TO REJECT ANY ENTRANT FOR ANY REASON THEY
DEEM NECESSARY AND APPLICABLE. ALL PARTICIPANTS ARE CONDUCT THEMSELVES IN A
MANNER THAT REFLECTS FAVORABLY ON THE SPORT OF AUTO RACING. FOUL OR ABUSIVE
LANGUAGE WILL NOT BE TOLERATED.
THE
MANAGEMENT RESERVES THE RIGHT TO CHANGE ANY RULE OR RULES THEY FEEL IT IS
NECESSARY AND REFUSE ANY PROTEST IF THEY FEEL IT IS UNNECESSARY AND BEING USED
FOR HARASSING REASONS. ALL FINES AND/ OR SUSPENSION WILL BE IN EFFECT AT ALL
EVENTS. THE INTERPRETATION AND INVOKING OF THE RULES PUBLISHED HEREIN SHALL BE
DETERMINED BY FMPOFFICIALS ONLY IN THEIR PROFESSIONAL DISCRETION.