Fairmont Raceway ~ Algona Raceway ~ I-35 Speedway

2008 360 Modified Rules

Revision 3 January 19,2008

AMENDMENTS TO THE RULES FOR 2008 HAVE BEEN UNDERLINED

(***) May be used in 2008, Not required,

The Tech Departments understanding is: This is an entry level class all replacement parts must be as used on an OEM Vehicle as a Stock replacement part,
Built to factory specifications by a major automotive supplier. Intended solely for Street use and mounted in the factory stock mounts and locations.
Engines may be machined to maximum OEM specifications as an automotive rebuilder would use to make a reliable street engine.
IE factory Service specifications.  All of above shall be applicable to all parts on the car unless otherwise noted below.
Amendments to these rules may be made at anytime. Decisions of the officials shall be final.

Items not allowed in A-Mod Class will also be disallowed in the B-Mod Class.

SAFETY EQUIPMENT:
1. Helmets are required and must be SA90, SA95, or SA2000 full coverage and should be worn at all times when the car in on the track.
Helmet must accompany vehicle at time of inspection. Fire suit of a flame-retardant nature must be worn. Two piece fire suits allowed.
Neck braces and fire resistant gloves are required. Racing shoes are required. Window nets are required. Must be mounted to the roll cage top and bottom.
Hans or Hutchins device allowed with out neck brace.
2. 5-point safety belts, sub belts, shoulder harness required. No Y type shoulder harness. No factory type belts or straps should be used.
Metal to metal buckles are required on shoulder and seat belts. The shoulder harness recommended not being more than one year old.
3. Sun shades must not be made of metal or plastic on the sides of the roll cage (Duct Tape only). Front sun visor must be metal only.
KILL SWITCH:
1.Kill switch required within easy reach of driver and clearly marked “ON” and “OFF”.

FRAMES AND BODIES:
1.Any legal WISSOTA or IMCA type frame allowed. Body Must match A-mod diagram.
Escape Hatch above driver is allowed and is reguired if you can not get out of pass window due to seat head restraints or your physical size.
Aluminum roof OK.
2. Frames may not be widened or narrowed and must be able to support roll cage on both sides. Front cross member may be notched for radiator clearance only.
Minimum frame and body height from ground is 4 inches. (Exception is front cross Members.)
3. Front suspension and steering must be unaltered OEM and be in stock location.  Must remain within original bolt pattern from type of frame used.
In cockpit, steering may be modified to suit driver’s taste, but must be kept on left side. No center steering allowed. No rack and pinion allowed.
Stock passenger car spindles only. No fabricated spindles allowed.
4. Tube-type upper A-frames allowed and can be moved.
5. No coil-over shocks allowed either front or rear. No homemade coil-overs can be used anywhere on car.
6. No jeep, Bronco, (etc) or 4-wheel drive frames allowed. No sport car or front wheel drives allowed.
7. 1 shock per wheel only.
8. Minimum wheelbase – 108 inches – on both sides.  No tolerance.
9. No spoilers, spoiler braces, nose wings engine covers allowed.
BUMPERS:
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 top loop. Should be made of minimum of 1 ¼” tubing and must be able to support car 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.
ROLL CAGES:
1. Must consist of continuous hoops not less then 1.666 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 in driver compartment.
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 with helmet on and strapped in driver’s seat. Roll cage must be securely supported and braced.
4. Low carbon, mild steel tubing is recommended. No brazing or soldering allowed.
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 as possible and located perpendicular to the driver so as to provide maximum protection for driver, but without causing undue difficulty in getting in or out of the vehicle. The 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
1.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 car. No Rear Axle Brake Floater Allowed, Caliper brackets must be solid mounted to the rear-end housing. No pressure limiting or check valves allowed. All frt. brake rotors subject to OEM minimum thickness. Rear rotors .810 minimum thickness
FUEL:
1. GASOLINE ONLY. Pump Gas.
2. Fuel cell vent hose must extend to within 2” from bottom of cell and be securely fastened!
3. Fuel Shut Off Handle in driver’s compartment recommended.
BATTERY:
1.One 12volt battery must be securely mounted and shielded inside frame rails. (Marine type battery box recommended). The (+) cable must be covered.
LOOSE OBJECTS AND WEIGHTS:
1. Loose objects and/or weights must not be used in driver’s compartment or outside of body or hood area.
Any weights added to other areas of vehicle must be securely mounted and should be painted white and have car number on it and attached with at least two, ½ inch bolts.
TRANSMISSIONS:
1. OEM manual transmission (3 or 4 speed). Must use stock cases, bearing plates and tail shaft housings for make and model trans being used.
All 3 or 4 forward gears and 1 reverse gear must work. Stock clutch or mini clutch allowed. Aluminum flywheel allowed. Must have Steel bell housing.
Flywheel must bolt to crankshaft. Clutch must bolt to flywheel. All must rotate with engine running.  Clutch operation: Must release pedal to move.
2. OEM automatic with a coupler. Must use a hand or clutch pedal valve for neutral. Bump starts allowed. Must use flywheel shield.
All forward and reverse gears must be operational at time of inspection. 153tooth OEM type Flex plate min. No Spoke Flex Plates allowed.
DRIVE SHAFT:
1. 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.
WEIGHT LIMIT:
1.2500 lbs all 360 Modifieds. Weights Rule maybe evaluated and adjusted at anytime.
COMPUTERS and TRANSMITTING DEVICES:  
1. No computers or transmitting or listening devices in car.
REAR ENDS and REAR SUSPENSION
1. Any passenger car type or truck rear end may be used. Floater recommended  2” inspection plug recommended to view Spool and/or gear.
Carrier may need to be removed if we cannot see what needs to be inspected.
2. No quick-change devices allowed. No cambered rear ends allowed.
3. No limited slip devices allowed. May run full spool, mini spool, or welded rear only. All Components Must be Steel. No lightened or light weight components allowed.
4. 72” between back of block and centerline of rear end.
5. Notice Due to advances in technology non-stock 4 bar and Z link suspensions are not allowed. Also both lower control arms must be the same length +/- 1 inch.
 Lower control arms must not run at an angle of more than 25 degrees up angle. Measured after the race with driver in the car
6. Minimum Panhard bar length 19" center to center of bolt holes..
7. One pull bar or lift arm only.
8. No Adjustable, Remote reservoir or Coil over Shocks Allowed. (Steel components only).
WHEELS AND TIRES:
1.No aluminum wheels, hubs, calipers or A-frames or any other suspension parts allowed. Plastic wheels are not allowed.
Calipers cannot be lightened and must be OEM. Rotors cannot be lightened or drilled.
2. Rims – (8”) width maximum. Bead locks on right rear only.
3. Tires – McCreary 0r Hoosier G-60 only. Tires must match tire on same axle. Tires will be the widest part of the car at all times.
 No exceptions I.E. If your rear end moves ahead door must be cut out for clearance not bent out for tire to move inside.
4. Mud Plugs allowed right rear and left rear inner only.
ENGINE, CARBURETOR & IGNITION (No removal of Casting, Stamping, or ID numbers)
A. Engine Block- OEM cast iron only, all modifications to factory service specs only. OEM bore and stroke combinations only, Lifter bores may not be altered.  Maximum 361ci (GM), 363ci (Ford), 368ci (Chrysler). Due to the many possible combinations of bore and stroke you may be asked to remove a head at the track for measurement. Gaskets will be at your expense. Subject to fine and loss of track points if found illegal.
B. Crankshaft- Must have a stock appearing rear crank flange. Balancing OK, No lightening, knife edging or reducing of the crankshaft circumference. It is recommended that you have a (2”) inspection hole above oil level in Oil Pan or you will have to drop Pan for inspection. Ford and Chrysler will require pan removal to verify crankshaft
C. Harmonic Balancer- Must be of OEM design with rubber mounted dampener ring
D. Connecting Rods- Must be of OEM design (IE If stock rod was “I-beam than Aftermarket must be “I-beam) It is also required the aftermarket rods weight the same or more than OEM. 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 pistons Allowed.
F. Camshaft- Solid Lifter or Hydraulic only, No Roller Camshafts allowed. Valley tray OK (recommend cutting tray at rear most lifter so lifter may be removed for inspection from the distributor hole).
G. Cylinder heads- must be unaltered approved OEM. All heads must have been used in a production vehicle. No limited production or special purpose over the counter only heads allowed. No porting, polishing or unapproved valve bowl work or other alterations of any kind to heads or intake. Heads may be reworked to accommodate the largest OEM valve size available in a production "on highway" use vehicle. If cutting new valve seats the ring left below the seat maybe removed with a carbide cutter in a head service machine only, one cutter angle only no multiple cuts. (No die grinder work anywhere no exceptions). Cylinder heads may use screw in studs and guide plates.

***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 allowed to ANY cylinder head. Guide plates, screw-in shouldered studs (0.375-inch max).
H. Valve Train- Stamped Steel or Stamped Steel roller tip rocker arms. Cast Steel roller tip rocker arms also will be allowed with Stock type pivot ball. Oil Deflectors allowed two bolts maximum.
I. Exhaust- 1. May 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.
J. Intake Manifold- Only stock Cast Iron unaltered 2- barrel or 4- barrel (4 Holes) intake manifold is permitted. Porting, polishing, port machining is not permitted. No Bowtie, VORTEC, SVO or W2, marine or other special production intake manifolds. No intake manifold to cylinder head spacers allowed.
***Unaltered Weiand aluminum - ‘IMCA stamped’ Chevrolet #7547-1; Ford 302, #7515; 351 Windsor # 8023; 351 Cleveland #7516; Mopar #7545.
K. Carburetor-
1. Carburetor will be 2-barrel only, Holley #4412 or #80583 Dorton equivalent 500cfm on any engine, otherwise Chevy-to-Chevy, Ford-to-Ford, etc.  No grinding or polishing of any kind allowed. All carburetor components manufactured by Holley. No Aftermarket base plates, metering blocks or carb bodies allowed. No milling or grinding of throttle shaft 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 guages will be used.
2. Steel, aluminum or Phenolic adapter plate or spacer allowed. Distance between the bottom of carburetor and top of intake manifold cannot exceed 1 ¼ inch! Total spacer height
3. No top Flow air filters or air diverting air cleaner housings.
L. Fuel Pump- OEM style diaphragm pumps only.
M. Ignition System- OEM Stock appearing (all components) Distributors only. Must run stock firing order.
N. Cooling system- Cooling system may be modified. Radiator and oil cooler must not protrude above interior. No electric waterpumps or cooling fans. No sprinkler systems. Any overflow tubes are to be directed to the ground, between frame rails.
O. Starter-All vehicles must have the capability of starting without being pushed or pulled. Starter must bolt to engine in factory location.
P. Other We will allow IMCA Northern SportMods - must be 100% IMCA legal, have IMCA license and hold track points at a sport mod track.
ENGINES ARE RESTRICTED TO NINE TO ONE COMPRESSION IN ONE OF THE TWO FOLLOWING METHODS-
9.0 to 1 compression ratio using Whistler. (Blue Box)
(or)
Cast iron heads only. OEM Production heads only. Flat top pistons only; GM cars - approved steel head numbers are - 014, 195, 267, 330, 336, 339, 388, 393, 441, 445, 454, 487, 493, 545, 598, 624, 642, 709, 799, 813, 862, 881, 882, 920, 991, 993, 997; Ford cars, no after market or SVO heads; Chrysler cars, no after market or W2 heads, 360 cubic inch heads only. Must be 76 cc heads or larger. Other heads may be approved call FIRST!!

Engine claim and Engine protest rules printed in the track rules

DRIVER & SAME CAR CANNOT RUN IN THE 360 MODIFIED & REGULAR MODIFIED CLASS THE SAME NIGHT.

Any Questions: Call TIM WEILAND @641-843-4230 Home or 515-341-0042 Office

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