butlermotorspeedway

 heads cannot be surfaced less thean 70cc)  2009
B-MOD RULES
IF ITS NOT IN THE RULES DON'T DO IT.

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 AMod
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. . 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- All weight must be fastened with clamps and must have two 1/2 bolts in it and  painted white .Weights must not be used in the drivers compartment or outside the body lines, NO WEIGHT ABOVE THE DECK. .
6.) WHEELS- Wheel width must not exceed eight (8) inches. No aluminum wheels. Bead locks
allowed on right side. 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 RacerKK704 . 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!!!!.
(NO VORTEC HEADS)
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.)  BLOCK &HEADS- OEM Cast block heads only.2.02 inch intake valves and 1.60 inch exhaust valves maximum, MAY USE DOUBLEHUMP OR POWERPACK HEADS.   Rocker studs may be pinned or non
shouldered screw in type. Stamped steel roller tip rockers arms ONLY!!!! Poly locks allowed , no stud girdles allowed. NO PORTING, POLISHING OR ANY ALTERATIONS ALLOWED!!!! NO BOWTIE OR AFTERMARKET BLOCKS!
(NO VORTEC HEADS)
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 stud girdles allowed. Stamped steel roller tip rocker arms
ONLY!!! Poly locks allowed. NO PORTING, POLISHING OR ANY ALTERATIONS 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 ALTERATIONS 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.  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. Hiems
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 hiem joint.
May mount 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- May use any stock 4412 Holley 2 or  4 barrel vacuum secondary with or without spacer , 1inch spacer MAXIMUM. NO ADJUSTABLE METERING BLOCKS ALLOWED! Choke horn must be intact. May remove choke butterfly. NO ADJUSTABLE SPACERS! Any dual plane intake manifold allowed.
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 starting 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.) EXHAUST- Any collector type header allowed. no 180 degree headers
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!!!! .
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!!!!!!!!!!!!!!!!