CENTRAL
MISSOURI SPEEDWAY
2008
B-MOD
RULES
The spirit and intent of these
rules are to keep down the cost of racing. Any
attempt to circumvent this intent will not be
tolerated.
1.) FRAMES- Factory production
complete full American passenger frames only. Frame
rails must extend to a point beyond the base of the
driver's seat. Rear clip may be fabricated out of
tubing. Front and rear pick-up loop required;
otherwise bumpers or other pick-up point will be
used.
2.) BODIES- Same as A- Mod
bodies. American compact passenger car only, such as
Pinto, Vega, Monza, Gremlin, Daytona, Mustang II,
etc. Fiberglass or metal duplicates may be used but
must be recognized as factory production, and must
have a complete paint job. (Same as aluminum A-Mod
body). Original roofline of body must be maintained
with a maximum two-(2) inch drop rear to front. Top
to be rounded in all directions. No flat tops. All
cars must have full floorboards and firewall's, both
front and rear. All cars must have sheeting of some
sort at rear of car at trunk area. Rear bumper to
deck lid enclosure optional. If enclosed it should be
solid panel at least eight (8) inches and include car
number. If no rear panel, use five (5) inch by five
(5) inch number plate on rear. Driver and passenger
side windows must have at least twelve (12)- inch
vertical opening. Driver's window must have approved
window net.
No spoilers, wings or any
other type of air/ground effects are allowed anywhere
inside or outside of the car. No protruding objects
allowed. All cars must have large legible numbers on
both doors and on top in contrasting color from body.
Numbers must be at least four (4) inches wide and
eighteen (18) inches high. Legible car number at
least five (5) inches high and one (1) inch wide on
front and rear. Bodies should extend no further
forward than back of block. Minimum of three (3)
safety bars must be installed in front of driver, and
may have screen attached thereto.
3.) WHEELBASE- 108 inches
minimum. 112 inches maximum both sides after races.
NO TOLERANCE!!!!!!!
4.) ROLL CAGE- Must consist of
continuous hoops not less than one and one half
inches outside diameter and must have a wall
thickness of at least .095 inch. Must be frame
mounted in at least six (6) places. Body mounted roll
cages not acceptable. Must consist of configuration
of front and rear hoops connected by tubing on sides
or side hoops in a manner deemed acceptable by the
inspector. Driver's head must not protrude above cage
with helmet on while strapped in driver's seat. Roll
cage must have a 3/16- inch inspection hole in
non-critical area. Must have at least three (3)
horizontal bars at driver's door welded to front and
rear of roll cage members.
5.) WEIGHT- Minimum weight is
2500 pounds with driver after race. NO
TOLERANCE!!!!!!!
6.) WHEELS- Wheel width must
not exceed eight (8) inches. No aluminum wheels. Bead
locks allowed on right front and right rear only.
Wheel discs (Mud Plugs) allowed but must be bolted or
welded or foam type. No DZUS fasteners. Does not have
to be IMCA certified.
7.) TIRES- American Racer G60
or Hoosier G60 or Hoosier 500. NO EXCEPTION. Maximum
tire width of nine (9) inches mounted on a
conventional one-piece steel wheel with a maximum
width of eight (8) inches. Tires may be sipped and
grooved.
8.) BRAKES- Disc or drum
brakes may be used front and rear. No aluminum disc
or brake calipers allowed. One (1) brake Bias
adjustable allowed. Brakes must be operational on all
four (4) wheels and must lock up all four (4) wheels
during inspection.
9.) FUEL SYSTEMS- Gasoline
only. No oxygen bearing additives. No pressurized
fuel systems. Fuel cells mandatory. Fuel cells must
be encased in an approved metal container of no less
than 20-gauge steel or 1/8 inch aluminum. Fuel cells
must be mounted between frame rails as far forward as
possible and using four (4), two (2) inch by 1/8 inch
metal straps, two (2) in each direction. Tip over
valve and Tank flapper valve required
Bumper must be equipped with a
drag loop extending below bottom of the cell. Fuel
cells must not extend below the rear end housing. 32
gal. maximum. No electric fuel pumps. Must have tip
over valve and flapper valve. NO EXCEPTIONS!!!!!
10.) BUMPERS- Bumpers must be
used front and rear. Front bumper must be mounted on
frame end and be of a semicircle configuration with
the bottom loop parallel to the ground. Front bumper
must be ten (10) inches high from bottom bar to top
bar. Material must be one and one quarter inch
minimum, two inch maximum O.D. steel pipe. Rear
bumpers may be constructed of pipe, square tubing,
but must not have sharp edges. Rear bumpers and nerf
bars must not extend beyond width of rear tire.
Bumpers must be able to support car when lifted by
wrecker.
11.) SEAT AND SEAT BELTS-
Racing seat mandatory. All cars must be equipped with
an approved quick release type seat belt and shoulder
harness securely fastened to frame and roll cage.
Seat belt material should be at least three (3)
inches wide AND CAN NOT BE OLDER THAN 2 YEARS. Seat
and steering wheel may be located to suit driver's
taste, but must be kept on the left side of the car.
No center steer.
12.) ENGINE- Must be OEM Cast
Iron Blocks and Heads. American make V-8 engines
only. Engines must be able to be used in conventional
passenger cars without alterations. Engine casting
numbers can not be altered. Maximum cubic inch limits
GM 361 CID, Ford 360 CID, Chrysler 370 CID. NO
TOLERANCE!!!! No Aluminum, Titanium or carbon fiber
components allowed. NO STROKER MOTORS!!!! Crankshaft
strokes allowed. SEE TABLE 1. Blocks allowed SEE
TABLE 2
Track has option to enforce
these restrictions with a cubic inch pump gauge, or
by visually checking parts and part numbers.
Disqualification and loss of points if found illegal.
MUST have a 1" Inspection
Hole on either side of Oil Pan with screw in type
plug.
13.) HEADS- OEM Cast cylinder
heads only. For casting numbers SEE TABLE 3. Gm-
maximum 2.02 inch intake valves and 1.60 inch exhaust
valves. Rocker studs may be pinned or non shouldered
screw in type. Stamped steel roller tip rockers arms
ONLY!!!! Poly locks allowed. No push rod guide
plates, no stud girdles allowed. NO PORTING,
POLISHING OR ANY ALTERCATIONS ALLOWED!!!!
FORD- Any cast iron OEM
production head with inline valves. No SVO heads
allowed. Maximum 2.04 inch intake valve and 1.70 inch
exhaust valve. No aftermarket heads. Non shouldered
rocker studs allowed. No Guide plates. No stud
girdles allowed. Stamped steel roller tip rocker arms
ONLY!!! Poly locks allowed. NO PORTING, POLISHING OR
ANY ALTERCATIONS ALLOWED!!!!
CHRYSLER- Any cast iron OEM
production head with in-line valves. No Canted
valves. No W-2 heads. Maximum 2.04 inch intake valves
and 1.70 exhaust valves. No aftermarket heads. OEM
rocker arm bar allowed. NO PORTING, POLISHING OR ANY
ALTERCATIONS ALLOWED!!!!!
14.) PISTONS & CAMS- Flat
top or dished pistons ONLY!!!!! Must use flat tappet
cam and lifters. No mushroom or roller lifters
allowed. No Roller or hydraulic cams allowed. CANNOT
ALTER LIFTER BORES. May use oil restrictors.
15.) ENGINE LOCATION- Rear of
engine (bell housing flange) must be at least 72
inches forward from the centerline of the rear axle.
The center of the crankshaft must be within two and
one half (2 1/2) inches of the centerline of the car.
NO TOLERANCE
16.) FRONT SUSPENSION- Front
suspension must match frame and be in stock location.
Parts must be replaceable from stock OEM type parts
from same type suspension except upper A-frame and
A-frame mount. Tube type upper A-frame may be used.
Fabricated A- frame mount may be used. Lower A- frame
cannot be altered. Adjustable A- Frame and shocks
must be steel. Heims joint. Stock passenger car
spindles only. No fabricated spindles. Adjustable
strut bars may be used on front end only. No coil
over shocks allowed either front or rear. One shock
per wheel. Steering box must be stock OEM type and be
in stock location. No rack and pinion steering. No
center steering. Adjustable sway bars allowed. Outer
tie rod and adjustable sleeve may be replaced by a
minimum .625 inch steel rod end and steel tube. Quick
Steers are allowed!!!!!!!!!!!!!!!!!!!!!. NO
EXCEPTIONS!!!!
17.) REAR SUSPENSION- Two
options: After market three link design or multi-leaf
spring deign. All components must be steel. All
mounts and brackets must be welded or bolted solid.
A.) Three link design requirements: must use minimum
19-inch long lower control arms. Must use one upper
control arm, solid tube only, (no pull bar spring to
biscuit assembly), located at the top center of rear
end housing. Pull bar must run parallel with drive
shafts close to center of drive shaft as possible.
(Interior configuration will be considered on this
ruling). May use minimum 19-inch long panhard bar
located behind rear end housing or minimum 19-inch
long j-bar mounted to a steel pinion bracket.
Measurements are from center of heim joint to center
of heim joint. Maymount rear spring directly over
axle housing or use coil over eliminators (sliders).
Lower spring perch or coil over mount must be welded
to rear end housing. No bird cages or floating mounts
allowed. Must use steel upper weight jack if spring
are mounted over axle housing. B.) Multi-leaf spring
design requirements: Must use steel multi-leaf
springs with no additional suspension components
besides one shock per wheel. Adjustable lowering
blocks allowed.
18.) REAR END- Any steel
approved OEM passenger car or truck non-cambered rear
end allowed, must be centered in chassis. All
components must be steel, except lowering blocks,
axle cap, and drive flange. Safety hubs (floater)
allowed. No quick change devices. Inspection hole in
housing required. Mini-spools only. Ring gear, center
section and yoke cannot be lightened. Solid steel
axles and one piece drive flanges only.
19.) CARBURETORS AND INTAKES-
Stock Holley 4412 500 CFM Carburetor ONLY!!! NO
ADJUSTABLE METERING BLOCKS ALLOWED!!!!!!!!!! Choke
horn must be intact. May remove choke butterfly.
Throttle bore not to exceed 1 11/16 inch. (1.6875).
Must use Edlebrock performance intake. GM 2101, Ford
2121, Chrysler 2176 ONLY NO EXCEPTIONS!!! Must use
one of three adapters Mr. Gasket part no. 1933,
Moroso part no. 64966 or HVH part no. 4412-2.
NO ADJUSTABLE
SPACERS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Changes made in attempt to equalize difference
between GM, Ford and Chrysler motors.
20.) OIL PANS- Extra capacity
oil pans are permitted. No dry sumps allowed. Oil
pump must mount in stock position.
21.) STARTER- Engine must have
working starter and be capable of staring car on
demand. Starter must be in stock location. NO
EXCEPTIONS!!!!!!
22.) TRANSMISSION/DRIVE SHAFT:
Only 3 and 4 speed manual transmissions allowed. All
forward and reverse gears must work plus a neutral
position. With engine running and car in still
position, driver must be able to engage car in gear
and move forward, then backward. Only OEM production
transmissions allowed. No 'in and out' boxes or quick
change devices allowed. No Berts, Brinns, Falcons,
Layne or Tonganoxie transmissions allowed.
Functioning shifts levers must be in OEM location.
One steel or aluminum flywheel allowed. Must be
bolted directly to end of crankshaft. Mini Clutches
allowed.
A.) Automatic: Must be
unaltered, two or three speed, OEM production case
with a functioning stock appearing pump. Must have an
approved scatter shield constructed of .125-inch by
three-inch steel, 270 degrees around top of flex
plate. Splined drive flange coupler with internal
pressure relief device, gate valve, or torque
converter. Hydraulic lines may not extend in to
cockpit.
B.) Manual: Must be unaltered,
three or four speed, OEM production case. Any clutch
and or mini clutch allowed. These components must
rotate, consistent with engine rpm, while car is in
any gear. Must use explosion-proof steel bell housing
with one hole for throw out bearing lever or hose,
must be 270 degrees around top of clutch and flywheel
area.
23.) DRIVE SHAFT- Minimum
two-inch diameter, white, steel drive shaft. Steel
slip-yokes only. 360-degree drive shaft loop required
and must be constructed of at least .25-inch by
two-inch steel, or one-inch tubing, mounted six
inches back from U-joint.
24.) BATTERY- All batteries
must be mounted in a safe manner.
25.) HELMETS & FIRE SUITS-
Helmets are required and must be worn art all times
car is on the track. All drivers must wear fire suits
of a flame-retardant naure. Two-piece suits are
allowed. Fire resistant gloves are mandatory. Fire
resistant boots are highly recommended. Helmets must
be SA-95, SA-2000 or SA-2005. NO M RATED HELMETS
ALLOWED!!!!! TAG MUST BE IN HELMET!!!!!! NO TOLERANCE
OR EXCEPTIONS OR YOU WILL NOT RACE!!!!!!!
26.) EXHAUST- Any collector
type header allowed. Exhaust must be directed away
from areas of possible fuel spillage. No zoomies.
Must have Schoenfield muffler. Inserts (Speedway part
no. 12530 or 43035) or (Schoenfeld no. 112535 or IMCA
609) ONLY!!! NO EXCEPTIONS!!!!!!
27.) KILL SWITCH, FIRE
EXTINGUISHER, WINDOW NET- A kill switch is required
within easy reach of the driver. This switch must be
clearly marked OFF and ON. Weights and or lose
objects are not allowed in the driver's compartment.
All cars must be equipped with quick release type
window net on driver’s door. No rear view
mirrors of any kind .Must have a Fire Extinguisher in
the car!!!! No radio communication or sound equipment
of any kind.
28.) GAUGES/ELECTRONICS-
12-volt ignition system only. HEI distributor only.
OEM firing order cannot be changed. Ignition rotor,
cap, coil and module must remain OEM appearing. No
ignition boxes, remote coil or accessories. All
wiring must be visible for inspection. Only gauges
allowed are analog oil pressure and water temperature
and analog tachometer (memory recall allowed). No
electronic traction control ALLOWED.
29.) THE TRACK AND ITS
OFFICIALS CAN INSPECT CAR AT ANYTIME AND ANYWAY
DEEMED NECESSARY!!!!!!!!!!!!!!!!
TABLE ONE- Crankshafts strokes
allowed:
GM -302 CID - 3.0
305 CID - 3.48
307 CID - 3.25
327 CID - 3.25
350 CID - 3.48
FORD- 289 CID - 2.87
302 CID - 3.0
351 CID - 3.50
CHRYSLER- 318 CID - 3.31
340 CID - 3.31
360 CID - 3.58
TABLE TWO- OEM Blocks allowed:
GM - 3892657, 3914678,
3932388, 3932386, 3956618, 3970010, 3970014,
10036033, 10066036, 14010207, 14010209, 14016376,
14016379, 14088548, 14093938, 14101148, 10066034,
10066098, 10105123.
FORD- Any OEM production block
CHRYSLER- Any OEM production
block
TABLE THREE- Heads
GM - 3986336, 3986339,
3986339x, 3986388, 3932441, 3973487, 3973487x,
3973493, 3951598, 468642, 333882, 3998920, 3998991,
3998993, 3998997
FORD- Any OEM production head
with inline valves. ( NO CANTED VALVES!!! AND NO SVO
HEADS!!!!!!)
CHRYSLER- Any OEM production
head with inline valves. ( NO CANTED VALVES!!!! AND
NO W-2 HEADS!!!!!)
MUST HAVE VISIBLE NUMBERS ON BACK
OF CARS
MUST HAVE 2 TETHERS ATTACHED TO
REAR BUMPER
REFER
TO GENERAL CAR AND SAFETY RULES
in “Track Rules & Regulations”
for more pertinent information.
