35 Raceway Park
2015 Sport Mod Rules
Same as UMP/AMRA/TSMA Modified rules.
Chassis, Frames and Bodies
UMP/AMRA/TSMA Modified frame
and body rules with the following exceptions:
-No coil over shocks
-No tubular front clips allowed.
-Air shocks not allowed.
-All coil springs must be at least four and one half inches outside
-Canister and/or adjustable shocks are not allowed.
1. Bumpers should be on both front and rear. Front
bumper should be mounted frame
end to frame end with the bottom loop parallel to the ground and 6.5″
apart from the
Should be made of minimum of 1 ¼” tubing and must be able to
if lifted by wrecker.
2. Rear bumper and body must not extend beyond width of rear tires.
3. Nerf bars must not extend beyond width of rear tires and must not
contain any sharp
edges. Open tubes must be capped.
4. Rear bumper may be constructed of tubing or flat stock, and must
protect fuel cell.
Center of bumper, front and rear, must be 18″ from ground. (2″
tolerance). No wider
than 5″ past the rear frame rails.
Open tubes must be capped.
1. Must consist of continuous hoops not less than
1.50 inch diameter
and must have a
wall thickness of at least .095.
2. Must be frame-mounted in at least 6 places. Roll bar padding required
3. Must consist of a configuration of front to rear hoops connected by
tubing on the
sides or side hoops. Driver’s head should not protrude above the cage
on and strapped in driver’s seat.
Roll cage must be securely supported
4. Low carbon, mild steel tubing is recommended. No brazing or soldering
5. Protection of feet is mandatory. Bar across back of engines with
vertical bars and
rub rails, or similar protection.
6. No brace bars forward of cage may be higher than stock put height.
7. A minimum of 3 driver side door bars must be parallel with the ground
and located perpendicular to the driver so as to provide maximum
but without causing undue difficulty in getting in or out of
sidebars must be welded to the front and rear of the roll cage members.
No brazing or
soldering allowed. Door bars less than .095 thickness should have 4 bars
at least 1-½
inches in diameter.
Driver doorplates required (5″ in front of seat to
rear of seat).
Brakes must be operated on all 4 wheels and must lock
up all 4 wheels during
inspection. Brake pedal balance bar only adjusting device allowed on
Axle Brake Floater Allowed, Caliper brackets must be solid mounted to
housing. No pressure limiting or check valves allowed. All frt. brake
rotors subject to
OEM minimum thickness. Rear rotors .810 minimum thickness
Front must be
No shutoff valves.
Gasoline ONLY, no alcohol. Racing fuel is allowed.
One 12 volt battery must be securely mounted and
shielded inside frame rails.
(Marine type battery box recommended). The (+) cable must be covered.
posts must be covered.
1. any OEM, or racing Manual
Transmission. At least 1 forward gear and 1 reverse
gear must work. mini clutches. allowed Cast iron flywheel or aluminum.
2. any OEM, or racing Automatic Transmission. At least 1 forward
gear and 1 reverse
gear must must be operational at time of inspection.
Must have working torque converter. 10 inch minimum
Drive shaft hoop is required and
must be constructed of at least ¼” by 2″ steel and
should be mounted at least 6″ back from front of drive shaft. Drive
shaft must be
painted white. 2″minimum diameter steel shaft.
2,500 pounds for all cars.
1. Any passenger car type or truck rear end may be
used. Floater recommended 2″
inspection plug recommended to view Spool and/or gear. May run full
spool, mini spool,
or welded rear Carrier may need to be removed if we cannot see
what needs to be inspected.
quick-change Rear ends are allowed.
3. No limited slip devices allowed. No cambered rear ends allowed.
4. 72″ between back of block and centerline of rear end.
5. Minimum Panhard bar length 19″ center to center of bolt holes. (2010
mounted panhard bar)
6. One pull bar or lift arm only. (2010 solid pullbar centered over
7. No coilovers no where
8. Non gun-drilled axles.
9. All steel rear end. Except for quick change center sections, drive
caps on floaters
and aluminum spacers for leaf springs. No lightweight spools or
ring and pinions.
Tires and Wheels
1. 8 inch wheels.
2. No aluminum wheels, hubs, calipers or A-frames or any other
allowed. Plastic wheels are not allowed. Calipers cannot be lightened
and must be
OEM. Rotors cannot be lightened or drilled.
3. Any 8 inch racing tire.
Cast Iron only. Maximum cubic inch limit of 390.
have a stock appearing rear crank flange. Balancing OK, No
lightening, knife edging or reducing of the crankshaft circumference..
Must be cast
iron crank, no steel.
be of OEM design with rubber mounted dampener ring
(SFI rating recommended)
be of OEM design (IE If stock rod was “I-beam than
Aftermarket must be “I-beam). Rod length is up to engine builder (does
not have to be
OEM length). Rods may use bolt and nut or cap screws to secure the caps.
E. Pistons- Cast or Forged, Flat top or Dished. No domed or gas ported
camshaft only. No roller camshafts allowed. Must pull 15
inches of vacuum at 1000 RPM’s. Must have access to vacuum port in
Cylinder Heads and Valve Train-Must
be unaltered approved OEM. All heads
must have been used in a production vehicle. No limited production or
purpose over the counter only heads allowed. No porting, polishing or
valve bowl work or other alterations of any kind to heads or intake.
202’s allowed. No
screw in studs. No pin studs. Must use stock diameter valve springs.
stamped rocker arms. No beehive springs. No studgirdal. No VORTEC heads.
No canted value (Cleveland style) heads!
use aftermarket headers. Exhaust system must be mounted in such
a way as to direct spent gases away from cockpit of vehicle and away
from areas of
possible fuel spillage.
Exhaust header outlets no higher than midline
of the body
sides. Officials may require turn downs on the collectors. Dual exhaust
only no “Y”
pipes or 180 headers. No oxygen sensors allowed.
cast iron or aluminum intake. No porting or enlarging inside of intake
gasket matching. No, VORTEC, SVO or W2, marine or other special
production intake manifolds.
No intake manifold to cylinder head spacers allowed.
barrell Holley 4412 only. No grinding or polishing of any kind allowed.
All carburetor components manufactured by Holley. No Aftermarket base
metering blocks or carb bodies allowed. No milling or grinding of
allowed, shaft must stay round. The choke and air horn may be removed,
this is the
only re-working allowed, must have stock measurements. Carb gauges will
Steel, aluminum or Phenolic adapter plate or spacer allowed. Distance
bottom of carburetor and top of intake manifold cannot exceed 1 ¼ inch!
height includes gaskets.
style diaphragm pumps only.
Stock appearing Distributors only (all components, even coil cover).
Must run stock firing order. No MSD boxes.
system may be modified. Radiator and oil cooler must
not protrude above interior. No electric water pumps or cooling fans. No
systems. Any overflow tubes are to be directed to the ground, between
vehicles must have the capability of starting without being pushed or
pulled. Starter must bolt to engine in factory location.
This is intended to be an economical
class. Rules will be
strictly enforced, absolutely no exceptions!