|
NO EXPRESS OR IMPLIED WARRANTY OR SAFETY
SHALL RESULT FROM
PUBLICATIONS OF OR COMPLIANCE WITH THESE RULES AND/OR
REGULATIONS
It is the responsibility of the driver of the car to see that his/her car
completely
satisfies the rules, including but not limited to all safety rules.
The driver of each
car represents to the promoter and all others that his/her car has satisfied
all
applicable rules, including but not limited to safety rules, whenever such
driver
participates in warm-up, practice or competitive laps and will sign an affidavit
to that affect. All cars must pass
a tech an inspection.
-
INTENT
The intent of this
class is to present a late model style division, without the
continuously rising costs that occur from unrestricted engines and the quest
for the newest innovation in suspension components. A Handicap system will
be used in an attempt to attract and include a wide range of chassis
design.
Engines are limited both in compression ratio and carburetion.
Weight breaks
are designed to chassis according to the level of sophistication.
Completing
models are limited to 1983 or newer American or Canadian Passenger car bodies.
-
COMPETING MODELS
Competing Models are limited to 1983 or newer American or Canadian Passenger
car bodies. During the first year, a Hobby car may sign up and will have
that year
to decide whether they are going to go with this class or stay where they
are.
1)
Fiberglass or aluminum replica bodies are mandatory.
2)
Models with stock wheel base under 102' maybe stretched to be included.
3)
Competitors will be required to keep their cars neat appearing and
maintained.
4)
It is mandatory to run all class sponsors logos on the body.
-
GENERAL CONSTRUCTION
1)
Chassis must be fully fabricated but should have a stock front clip
(sub-frame),
cups with straight frame rails, such as mid 1970
Camaro, must be attached to
the lowest point of rails.
Clips with kick out frame rails, such as Chevelle,
Monte Carlo or Galaxy must utilize enough stock to
neatly match fabricated frame.
2)
Competing cars must fit one of 3 subclasses: Type 1, Type 2,or Type S.
a)
Type 1 Pro-Stock is defined as stock front clip or fabricated clip with
lower control arms in stock location and retain original dimensions.
No coil over springs or shocks.
1)
O.E. spindles unaltered (steering arm may be shortened or lengthened).
2)
Steering box to remain in original position.
3)
O.E. brake components (calipers and rotors).
Hubs must have 5 x 5 bolt
pattern.
b)
Type 2 Pro-stock will be cars meeting class 1 front clip requirements,
and having
the following:
1)
Aluminum brake components, and/or wide 5 hubs (Dillon or Star-lite).
2)
Non-OEM, or fabricated spindles and/or rack and pinion steering.
3) Any
car with Coil Overs.
c)
Type S Pro-stock must meet requirements for stock front clip, plus:
1)
Maintain original frame rails (rocker boxes) back to the rear axial
centerline.
2)
Rear suspension points remain stock.
a)
Leaf spring cars may use weight jack.
3.
Interior area of car must be completely enclosed in respect to engine,
track surface, tires and fuel cell (trunk area).
a)
All panels in the immediate area of the driver must be constructed of
steel minimum 22 gauge (including floor, front and rear firewalls and trans,
Tunnel vertical).
b)
Other interior panels maybe .040 aluminum.
c)
Driver must be completely shielded from battery.
4.
Windshield area to be completely covered, tempered Plexiglas or Lexan.
a)
Window net mandatory on driver’s side, right side windows to remain
open.
b)
Windshield straps subject to tech advisor approval
c)
Rear window opening must e filled to complete roofline.
5. Bodies to remain stock appearing.
a)
Must have all body panels to race (consideration will be made to start
main
event, if damage occurred in preliminaries).
b)
Spoilers may be added to rear deck lid ONLY. May be a maximum of 6
inches
deep, measured from intersection with deck list to tallest point, no wider than
rear quarter panels. No airfoils.
No side verticals.
c)
No exterior rub-rails; or reinforcing.
Jack points and trailer hold down hooks
must not exceed beyond bodylines. Body
must be kept neat and free of jagged
edges.
d)
No holes in the hood or anything protruding through the hood or front
fenders.
Must have a smooth body. (Backward
hood scoop allowed).
e)
Front air dams optional, subject to stock appearing.
f)
No mirrors allowed.
D)
ROLL CAGE in driver’s compartments must be constructed of round
carbon mechanical
tubing 1 ¾ - .095 wall thickness.
1. Continuous
bends only. No butt-welded comers.
2. Inspection holes may be requested.
3. Allowable dimensions for frame rails (2x3x.083) (2x2x.120)
4. .095 tubular bumpers
front and rear.
E)
SUSPENSION. Maximum
track 69" (front and rear) measured at tire centerline to tire
centerline. Minimum ground clearance is 4" measured at lowest part of frame
rails,
side skirts and front spoiler.
1.
Upper control arms and mounts may be fabricated.
OEM lower control
arms must retain stock dimensions aftermarket bushings and ball joints
permitted.
2. Rear
truck arms permitted.
3.
Fabricated rear suspension should be parallel leaf springs (with
dampener)
or 3 pt with 5" coils.
a)
No spring bars on lower links.
b)
Spring centerline should not share shock centerline –subject
to weight adjustment.
4.
Steel body shocks only – subject to added weight.
5.
Floater rear hubs recommended – quick change optional.
6.
All cars will have a minimum 5/8" lug studs.
7.
Steel wheels only; nominal 10" max.
F) ENGINES
1. Cast iron engine blocks and cylinder heads (OEM) only.
2.
Forged or nodular iron crankshafts only.
After market cranks permitted
but should be approximate weight of the like original equipment piece.
Maximum Cubic inch for all classes 360 (+ .040 mopar only).
3. Connecting rod must be steel (forged or billet) length
optional.
4. Cylinder heads must be O.E. origin unless otherwise stated.
a)
Small block GM, straight plug only.
1)
World products s/r torque permitted, straight plug only.
2)
No bow tie.
3)
Maximum valve diameter 2.05/1.6
4)
No Ford N heads.
b)
Small block Chrysler, w-2 permitted (as cast).
Maximum valve
diameter 2.02/1.6.
c)
Ford
1)
351 "c" 2bbl. (open chamber heads only on Windsor blocks).
Fabricated spacers may not exceed ½" thick.
d)
Use of "form tool" or "bowl hog" OK, cut not to
exceed depth of 1" into
valve pocket. All work to be concentric to guide centerline.
No hand
blending.
e)
Intake ports may be matched to gasket on head side only, may not exceed
3/8".
f)
Roller rockers and stud girdles permitted.
Stud type rockers only, except
Chrysler.
5.
Engines should be mounted so that:
a)
Minimum height to 11" with the driver in the car.
b)
Forward-most spark plug should be inline with stationary lower ball
joints
and shall be no more than 3 ½" set back from centerline of spindle for
Type
S and Type 1 cars.
c)
Cross members may be altered to accommodate front sump engines in GM
clips. Suspension pivots must
remain in original position.
6.
Iron intakes are allowed, 1 5/8" spacer including gasket.
Aluminum intakes are allowed,
1" spacer.
7.
Flat tappet camshafts only, no mushroom.
a)
No after market drive devices (2 sprocket chain only).
b)
Lifter diameter to match engine as produced.
8.
Pistons must have 2 compression rings and one 3/16" oil ring.
Flat top pistons only.
9.
Ignition may be single coil type with breaker in distributor, no
magnetos, no capacitor
discharge, no crank triggers. M.S.D.
style.
10.
Carburetors must be in "as produced," condition not flowed or
reworked.
a)
Choke butterfly and linkage may be removed.
Normal tuning changes such
as jets, power valves, pump nozzles permitted.
b)
Class carburetor for all Pro-stock types will be Holley list 4412. 1-3/8
Ventura,
1-11/16 throttle plates.
c)
Block mounted mechanical fuel pumps only.
11.
Wet sump oil system only (single stage pump) must be OEM design with
chosen engine.
12.
Exhaust headers permitted, mufflers required subject to Big Sky Racing
Association
noise requirements.
a)
Exhaust system must exit behind or away from driver.
b) Exhaust must be shielded from contact with driver or
safety
personnel in the event of an
emergency.
13.
One 12 volt passenger car battery only.
14.
Minimum fuel cell height will be 8" measured with driver and car on
level surface.
15.
Drive train/Clutch.
a)
Approved scatter shield or containment method required on all cars.
1) Multi-disc clutches (Tilton, Quartermaster) may use aluminum
bell housing.
2)
Reinforced belting acceptable as containment method.
3) Ram coupler allowed.
b)
Transmission must be O.E. origin, must have 2 forward gears and reverse
in
working order; O.E. Automatic Transmission allowed.
1)
Minimum clutch diameter disc must be 5" and must be mounted on
crankshaft.
c)
Driveline must be painted white and have drive shaft loop.
G.
ACCESSORIES
No radios, on-board
computers, traction devices, automated electronics, recording devices or
digital
readout gauges permitted.
H.
HANDICAP GUIDELINES
Weights after
time in and main event as finished!…………………..57% Left
Type 1 Stock
clip with stock spindles and iron brakes.
a.
8.5 lbs per cubic inch.
Type 2
Stock clip with after market spindles and brake components.
a. 8.75 lbs per cubic inch
Type
S
Stock clip with stock rear suspension design and stock spindles with iron
brakes.
a. 8.25 lbs per cubic inch.
Minimum weight for
all Pro-stock classes will be 2800 lbs.
All cars must have
their weight and type clearly marked on the upper left corner of their
windshield.
Example: #44, 3170T, Type S
Top 3 cars will be
weighed after main event.
Tires: Must run BSPRA approved tire purchased from
BSPRA. For the 2004 season, said
tires will
be
American Racer Tire. Six
tires maximum allowed per car on first weekend with one tire per
weekendavailable for purchase per Pro-stock race thereafter.
No banking of tires (i.e.: if
you do not
purchase
your one tire for the weekend, you are only allowed one
again at the next race, not two).
Pro-stock Class is
governed and subject to all Big Sky Pro-Racing Association requirements for
safety
and
appearance. Big Sky Pro-Racing
Association’s Directors reserves the right to interpret
and/or adjust any
and
all rules outlined herein in the interest of competition.
|
