Texoma Motor Speedway
2008 Southern Sport Mod
Rules
The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events, and by participating in these events, all participants
are deemed to have complied with these rules. NO EXPRESSED OR IMPLIED
WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH
THESE RULES AND/OR REGULATIONS. They are intended as a guide for the
conduct of the sport and are in no way a guarantee against injury or
death to a participant, spectator or official.
The race director shall be empowered to permit reasonable and
appropriate deviation from any of the specifications herein or impose
any further restrictions that in his opinion do not alter the minimum
acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY
SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any interpretation
or deviation of these rules is left to the discretion of the officials.
Their decision is final.
Revised November, 2007. Revisions/clarifications are underlined,
recommendations are italicized.
SOUTHERN SPORTMOD RULES - 2008
1. SAFETY EQUIPMENT:
Rules apply at all times car is on track. Snell-rated SA2000 or
SA2005 helmet required. (Effective January 1, 2008, SA95 helmets are no
longer allowed). Roll bar padding required in driver compartment (Fire
retardant recommended).
SFI-approved full fire suit required. Fire retardant neck brace, gloves
and shoes required.
Recommended: Fire retardent head sock and underwear; head and neck
restraints; collapsible steering shaft.
Driver-side window net required, minimum 16”x20” ribbon or mesh style,
and must be mounted so quick release latch is at top front of window.
Minimum three-inch wide SFI-approved five point safety belt
assembly required (Y-type shoulder harness not allowed), must be
mounted securely to roll cage,
recommended to be no more than one year old.
Kill switch required within easy reach of driver and emergency
personnel, must be clearly marked ‘OFF’ and ‘ON’.
2. FRAME:
1978-1987 OEM midsize GM metric full frame only. Minimum wheelbase
107-inches, maximum 109-inches, both sides. Frame must be full and
complete, cannot be widened, narrowed, shortened, lengthened, or be cut,
bent, or altered to change suspension brackets, except upper control arm
brackets on front end. All frame bolt holes must remain in OEM location.
Front frame horns may be removed in front of steering box. Front frame
may be cut for radiator clearance. Frame may be notched for seat
clearance. Transmission crossmember mounts may be removed, no further
forward than frame welds. Rear of frame, behind upper shock mounts, may
be replaced with round, square, or rectangular tubing. No part of frame
can be lower than five inches from ground except front crossmember. No
other frame alterations allowed.
3. ROLL CAGE:
Must consist of continuous hoops, minimum 1.5 inch O.D. tubing, with a
minimum wall thickness of.095 inch for main cage. Cages must be steel or
chrome-moly. Main cage no further forward than rear of engine and no
further back than front edge of rear tire. Four bars, two per side, may
extend from main roll cage to main frame points in front of the upper
control arms. These bars may have two additional braces per side to the
main frame. Six bars may extend from the main cage to the rear.
X-bracing is allowed. Driver’s head must not protrude outside cage with
helmet on. Roll cage must be securely supported and braced with minimum
one cross bar in top halo. All bars forward of cage must be lower than
hood.
4. DOOR BARS:
Minimum three driver side door bars required, minimum 1.5 inch O.D. and
.083 inch wall thickness, must be parallel to ground and perpendicular
to driver, and welded to front and rear of roll cage. Minimum two
passenger side door bars required, must have at least one cross door
bar, horizontal or angled. Steel door plate, 18 gauge or .049-inch
5. BODY:
(See diagram) Must be same width, front to rear, and parallel to OEM
frame. Engine compartment must remain open (no side panels). Aluminum or
fiberglass hoods allowed, must completely cover top of radiator and
engine, extending from nose to interior deck and enclosed at rear. Must
have front and rear roof supports. Aluminum or fiberglass roof allowed,
must meet body diagram. No Gremlin roofs. No plastic body panels or
filler panels allowed. Must have complete interior deck from side to
side, must be aluminum or sheet metal. Quarter panels must remain
90-degrees to ground, maximum 45-degree bend 4-inches from bottom and
2-inches from top of doors and quarters. Rear spoiler may be maximum
8 inches in material height and maximum 67 inches wide. Spoiler may have
stiffener, must be 1 inch or more down from top. Maximum 3 spoiler
braces allowed, must be mounted in line. Spoiler braces must resemble
all aspects of drawing. No fins, lips or wings allowed.
6. DRIVER COMPARTMENT:
Must have minimum three 5/16 inch O.D. windshield bars in front of
driver. Aluminum cowl panel in front of driver can be no wider than
cockpit. Aluminum high-back seat only, must be securely bolted, using
minimum 0.375-inch bolts, to roll cage and support system. Floor pan
must be metal or aluminum and cover entire driver compartment. Bottom of
seat can be no lower than bottom of frame rail. Driver must be sealed
off from track, driveline, engine, fuel cell, cannisters and pumps. No
oil coolers allowed in driver compartment. No devices that would enable
driver adjustment to alter wheelbase or for weight jacking while car is
in competition. No mirrors of any kind.
7. FRONT SUSPENSION:
All components must be steel, unaltered OEM, in OEM location, and match
frame. No jack bolts allowed. Adjustable spring buckets are allowed.
Must use OEM upper and lower A-frames and mounts. OEM upper A-frame
may be replaced using aftermarket upper A-frame (STEEL only), must
display “IMCA approved” decal. Upper A-frame mounts may be modified
and moved for caster and camber adjustment, but must remain OEM
material. Lower A-frame mounts and bolt holes on frame must be in OEM
location, mount may be notched for clearance. All A-frame bushings may
be aftermarket, but no bearing/heim type. OEM style ball joints only,
may be tacked in. Sway bars(optional) and brackets must remain OEM.
8. STEERING:
All components must be steel, unaltered OEM, in OEM location and match
frame. No grinding, lightening or welding on any steering parts. Spindle
may be reamed and bolt on spindle savers are allowed. Steel steering
shafts and knuckles only. Steering quickener (optional), steering wheel
and quick release (required) may be aluminum. Power steering pump and
reservoir must remain one unit. Driver compartment steering may be
modified, must be kept on left side. No rack and pinion.
9. SHOCKS:
One steel shock per wheel only. Shock must be in OEM mounts and
location, using OEM style shock. Mounting spacers and weld or screw-on
shock ends allowed. No air or coil-over shocks, remote reservoir shocks,
Schrader valves or bladder type valve allowed.
10. SPRINGS:
One steel spring (racing allowed) per wheel only. Minimum 4.5-inches O.D.,
non-progressive coils only. No torsion bars or air bags.
11. REAR SUSPENSION:
All control arms and mounts must be steel, unaltered OEM, in OEM
location, and match frame. No jack bolts allowed. Adjustable spring
buckets allowed, may be dropped as long as they remain in OEM location.
If upper spring cup uses all thread, it must be securely welded to
chassis. Lower spring cups must be centered on housing. Control arms may
be reinforced, but cannot be shortened or lengthened, must remain OEM
length. All control arm bushings may be aftermarket, but no bearing/heim
type. Bushings cannot be drilled. No suspension parts may be
altered or lightened. No aluminum parts allowed, other than bushings.
12. REAR END:
Must use OEM 7.5-inch GM 10 bolt rear end (bracing optional), must
remain stock width. No Ford or floater rear end allowed. Housing end,
from control arm mount out, may be modified with 3-inch tubing to accept
9” Ford axle. If Ford axles are used, rearend must remain minimum GM
width or maximum 3-inches wider. Steel components only. OEM mounts on
lower control arms must remain in OEM location on original 7.5-inch tube
housing. Aftermarket axles, mini-spools and C-clip eliminators allowed.
Locked rear ends only, no torque dividing differentials allowed. No full
or aluminum spools allowed. Pinion angle can not be changed. Any gear
ratio allowed but housing must remain unaltered. No quick change
devices.
13. BUMPERS/RUB RAILS:
Steel only. Two bar front bumper and single bar rear bumper must be used
on car at all times and welded, or bolted securely using minimum 0.375
inch bolts. Must be maximum 1.50-inch O.D. tubing, .095-inch wall
thickness on front and 1.75-inch tubing, .095 wall thickness on rear.
Maximum 1.50-inch O.D. tubing, .095-inch wall thickness fuel cell
protection bar required, must cover rear and extend past both sides of
cell, may be welded to rear bumper. See diagram for bumper heights. Rear
bumper may be maximum 6-inches beyond rear deck. All bumpers and rub
rails must be capped with no sharp edges. Single bar rub rail from front
to rear wheel allowed on each side, no center supports allowed, maximum
1.50-inch O.D. tubing and .095-inch wall thickness, must be mounted to
cage at front and rear of rub rail.
14. TIRES/WHEELS:
Must use Hoosier ‘500’ Race tire, with IMCA stamped on sidewall. 27 by 8
by 15 or 26.5 by 8 by 15 ‘stagger tire’ allowed. No siping allowed
(Refer to General Rules and Procedures for automatic penalties).
Grooving allowed. No re-caps. Effective July 1, 2008, all wheels must
display white “IMCA approved” decal and wheel manufacturer decal.
Any offset allowed. May use IMCA approved bead lock, on right rear
only. External steel bead lock only and it cannot make wheel any
narrower than 8-inches and no wider than 8.75-inches. Steel bolts only.
Outer foam or plastic mud cover allowed on right rear only. Inner mud
cover allowed on left rear only. No bleeder valves.Must use minimum
1-inch O.D. lug nuts and 0.625-inch studs are recommended. No wheel
spacers allowed with OEM studs. Wheel adapters are treated as spacers
and may be aluminum, maximum 1.50-inches thick.
15. BRAKES:
Must be steel OEM, operative three wheel, drum or disc. Must maintain
minimum OEM dimensions for hubs/rotors and calipers, cannot be
lightened. Bolt pattern may be changed. 0.625-inch studs allowed. Single
or dual aftermarket master cylinders allowed. Driver adjustable dual
pedal brake bias allowed. Additional proportioning valve (in-line type)
allowed, must be out of driver reach. Rear rotors may be aftermarket,
minimum 0.810-inch thickness, maximum 12-inch O.D. Vented rotors only,
no scalloped, ceramic coated, single phase or drilled rotors allowed.
Rear caliper brackets must be welded to housing.
16. EXHAUST:
Must use Schoenfeld headers. GM: #161, #151, #151E with 1.625-inch tubes
and 3-inch collector. Chrysler: #461, #461W2, #462W2. Ford: #351, #361,
#362, #562, #562-4B #563-4B. No header modifications allowed. Coated
headers allowed. No exhaust sensors, merge collectors, cross
overs, turn outs or balance tubes. Schoenfeld mufflers, stamped IMCA609,
must be used if track has noise reduction rule of 98 d.b. or more.
17. FUEL SYSTEM:
Racing fuel cell required, maximum 22 gallon capacity, must be in
minimum 20 gauge steel container. Must mount with minimum two solid
steel straps around entire cell, two inches wide and 0.125 inch thick,
between frame rails in trunk area only. Fuel cell vents, including cap
vent, must have check valves. If fuel cell does not have aircraft
style positive seal filler neck/cap system - a flapper, spring or ball
type filler rollover valve is required. No part of cell can be lower
than protective tubing. OEM mounted, mechanical push rod fuel pumps
only. No regulators, bypass fuel systems, pressurized, or return lines
allowed. CARBURETOR (one only): Holley(unaltered) #4412 or #0-80583-1,
500 cfm two barrel may be used on any engine. OEM GM Quadrajet or two
barrel may be used on Chevy. OEM Motorcraft four or two barrel may be
used on Ford. OEM Carter or AFB four or two barrel may be used on
Chrysler. OEM carburetors must remain unaltered, circle track floats may
be installed. No other carburetors allowed. Adapter/spacer allowed,
maximum 1.250-inches thick, including gaskets. No driver compartment
adjustable carburetors or spacers. Limit of one fuel filter. No cool
cans. Any air cleaner allowed. No cold air boxes allowed.
18. FUEL:
Gasoline only. Racing fuel allowed. No performance enhancing additives
or scented additives. Fuel must pass both dielectric meter and chemical
tests. Fuel sample may be taken from any car at any time (Refer to
General Rules and Procedures for automatic penalties).
19. WEIGHT:
Minimum weight limit of 2,350 pounds after race with driver in car.
Weights must not be used in driver compartment or outside body. All
weights must be securely mounted with at least two, .5-inch bolts,
painted white with car number on it. No titanium, magnesium, stainless
steel or carbon fiber components. Solid steel fasteners only.
20. BATTERY/STARTER:
One 12-volt battery only. Must be shielded and securely mounted.
Aftermarket starter allowed, must bolt in OEM location. Must have
capability of starting without being pushed or pulled. Must leave
initial staging area on demand, unaided, or go to rear of that race.
21. GAUGES/ELECTRONICS:
No unapproved cameras, transmitting or listening devices, timing retard
controls, or digital gauges (including tach). No electronic monitoring
computer devices capable of storing or transmitting information except
analog tach. OEM style ignitions only. GM: HEI distributor (must remain
one unit) or point distributor allowed. Ford/Chrysler: may use OEM
ignition, including OEM boxes, or HEI distributor. Any module may be
used that fits inside the distributor with no alteration. Vacuum advance
may be removed and pick-up coil locked. No external coils allowed,
unless using point distributor. No GM or aftermarket ignition boxes
allowed. No electronic traction control devices (Refer to General Rules
and Procedures for automatic penalties).
22. TRANSMISSION/DRIVE SHAFT:
Only OEM production transmissions allowed. No aftermarket transmissions
allowed. No ‘in and out’ boxes or quick change devices allowed. With
engine running and car in a still position, must be able to engage car
in gear and move forward, then backward. Functioning shift levers must
be in OEM location. Transmission fluid coolers allowed. Flywheel,
flexplate and converter must be steel.
Automatic:
Any OEM automatic transmission allowed. Must use functioning, minimum
10-inch diameter steel torque converter. No direct drives, couplers,
valved pumps, or bleeder style valve bodies. Must have at least one
forward gear and reverse gear, gears must function. Must have an
approved scattershield constructed of .125-inch by three-inch steel, 270
degrees around top of flexplate. GM automatic must be used with GM
engine, may be used with Ford or Chrysler engine. Stall converters
allowed. Steel OEM style flexplate only, must be bolted directly to end
of crankshaft.
Manual:
3, 4 or 5 speed OEM manual transmissions only. All gears must function.
Must have functioning 10.5-inch minimum diameter clutch and pressure
plate bolted directly to steel flywheel. These components must rotate,
consistant with engine rpm, while car is in any gear. Must use
explosion-proof steel bellhousing 180 degrees around top of clutch and
flywheel. No mini-clutches or couplers. Minimum 9-inch diameter Ford
clutch allowed. Hydraulic slave cylinder/throw out bearing allowed.
Drive Shaft:
Minimum 2-inch diameter, white, steel drive shaft only. Steel slip-yokes
only. 360-degree drive shaft loop required, constructed of at least
0.125-inch by 2-inch steel, or 1-inch tubing, mounted 6-inches back
from front U-joint.
23. ENGINE COMPARTMENT:
Rear of engine (bellhousing flange) must be mounted at least 70-inches
forward from centerline of rear axle. Minimum 11-inch engine height from
ground to center of crankshaft. One radiator allowed, steel or aluminum,
27-inches by 19-inches maximum in size, must be mounted in front of
engine. Racing cap and electric fans allowed. No sprinklers. Catch can
required. Power steering pump and reservoir must remain one unit and
mount in front of engine. Side engine mounts (OEM or 45-degree style)
must be steel, aluminum mid-plate allowed.
24. ENGINE SPECIFICATIONS:
Must use OEM cast iron, American make V-8 small block engines only. No
bowtie, SVO or W-2 components allowed. All engines must be able to be
used in conventional passenger car without alterations. External engine
casting and threaded holes cannot be altered. No aluminum, titanium or
carbon fiber components allowed.
BLOCK:
GM (Chevy only): 283, 302, 305, 307, 327, 350. Ford: 260, 289, 302, 351.
Chrysler: 273, 318, 340, 360, no hemis. Maximum cubic inch limits: GM
364 c.i., Ford 360 c.i., Chrysler 370 c.i., no tolerance. No 400 or
larger cubic inch parts allowed. Flat top or dished cast pistons only,
Chevy must use 4 valve relief. No gas ported or floating pistons.
3.48-inch maximum GM stroke. Maximum 175 lbs. per cylinder compression,
no tolerance. Compression checked with one spark plug removed, turned
five engine revolutions. Engines may be balanced and block decked. Oil
filter system must remain OEM. ‘Wet’ sump oiling system only. No
accusumps. OEM rods. Chevy must use maximum 5.7-inch rod. Steel or cast
OEM crankshafts only. No splayed main caps. Racing oil pans allowed. One
inch inspection hole recommended in pan - no obstructions to crank and
rods. If obstructions are present, must remove pan for inspection.
Engine bolts may be aftermarket. Fluid dampener balancer allowed. No
roller bearings allowed.
INTAKE:
Unaltered, approved OEM cast iron low rise, two- or four-barrel; or
unaltered Weiand aluminum – ‘IMCA stamped’ Chevrolet #7547-1, Ford 302
#7515, 351 Windsor #8023, 351 Cleveland #7516, Chrysler #7545. No
porting, polishing, or alterations of any kind, including cooling lines
or plenum alterations to ANY intake. No OEM hi-rise, marine or
bowtie intakes. Ford may use OEM aluminum intake, no under air or
hi-rise. All intakes must have unobstructed 0.250-inch vacuum fitting.
Belt driven, OEM style water pumps only, no aluminum water pumps on
Chevy engine.
CAMSHAFT:
Non-roller hydraulic cam/lifters only. Hydraulic lifters must remain
UNALTERED OEM. No maximum cam lift. Must pull 12-inches of vacuum at
1200 rpms. Vacuum to be pulled at intake vacuum fitting, not carburetor.
No alterations of any kind may be made at time of tech. Track equipment
being used for tech is final. Lifter bores cannot be altered. Must be
chain driven, no gear/belt drives.
CYLINDER HEADS:
Only GM OEM approved head numbers are (last 3 digits): 126, 185, 336,
441, 445, 487, 493, 598, 624, 862, 882, 920, 993, 997, with valve no
larger than 1.94-inch intake and 1.50-inch exhaust. May use Engine
Quest (EQ) Stock Replacement (SR) cylinder head, part number CH350I,
head must remain as produced, valve sizes can not be changed. No
porting, polishing, or unapproved alterations to ANY cylinder head.
Any cast iron OEM Ford and Chrysler heads allowed with valves no larger
than 2.04-inch intake and 1.70-inch exhaust. Headers must bolt directly
to heads with correct numbers. No vortec, bowtie, SVO, W-2 or
aftermarket heads allowed. Flat milling allowed. Guide plates, screw-in
shouldered studs (0.375-inch max) and polylocks allowed, no stud
girdles. Stamped steel, OEM style, stud mounted (0.375-inch max) rocker
arms only. Chrysler may use OEM rocker arm bars. Any length push rods
allowed. OEM diameter springs must match heads (no beehive valve springs
allowed).
25. ENGINE CLAIMING RULES:
Refer to General Rules and Procedures for claim eligibility
requirements.
(A)
$500 cash and exchange claim on engine, $50 goes to wrecker for pulling
engines.
(B)
Claim does not include - 1. flywheel, 2. clutch, 3. pressure plate, 4.
bellhousing, 5. breathers, 6. carburetor, 7. starter, 8. motor mounts,
9. oil/temp. sending units, 10. fan and pulleys, 11. clutch ball, 12.
clutch arm, 13. throw out bearing, 14. dip stick, 15. water pump, 16.
fuel pump, rod and plate, 17. distributor, 18. plug wires, 19. water
outlet and restrictor, 20. headers.
NOTE:
During engine claim, inspect heads and intake, and one spark plug must
be removed to check pistons prior to transfer of engines. If, at this
time, an engine is found illegal, driver is disqualified and suspended
from all IMCA sanctioned events until such time as a $250 fine is paid,
for first offense. Exchange of engines may proceed depending on
circumstance. Decision to proceed is at discretion of track officials
and/or IMCA.
26. ENGINE PROTEST PROCEDURES:
Within 5 minutes after race, any driver starting feature may, for $250,
protest any engine. $50 of the protest fee goes to track and will not be
refunded, regardless of protest outcome. Driver may not protest another
driver finishing in a position behind them and may not protest same
driver more than once per calendar year. Under this protest, following
MUST be inspected: intake manifold, cylinder head (removal required),
stroke, and visual inspection of crankshaft (pan may be removed). $200
will be returned to protestor if engine is found illegal. If engine
being protested is found legal, $200 protest fee will be paid to driver
being protested. If parts are found illegal, or if driver refuses to
submit to protest, first infraction will result in forfeiture of all
cash and contingencies, trophies and points earned in feature.
27. POINT STRUCTURE /PROCEDURES:
Refer to General Rules and Procedures.
28. EIRI:
(Except in rare instances) Decisions of officials are final and binding
without exception. In some cases, track safety rules may take precedence
over IMCA rules - any discrepancy between IMCA and track rules should be
brought to the attention of IMCA. Any rule changes or clarifications
during the course of the year will be amended on www.imca.com as well as
published in Inside IMCA, the official newsletter of IMCA, and will be
considered as an official part of these rules.
For more information, call Tom Gutowski at 402-350-6120, or IMCA at
319-472-2201.
Copyright© 2008 IMCA All rights reserved.
No part of this publication may be reproduced, stored, or transmitted in
any form, without prior written permission.