Late Model Rules

Williams Grove Speedway 2010
358 Late Model Rules & Regulations

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RULE BOOK DISCLAIMER
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, and, by participating in these events, all participants are deemed to have complied with these rules. NO EXPRESS OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATION 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 minor 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.

1. FRAME - Minimum wheelbase of 103 inches, tolerance of 1/2 inch. Frame rails must be either a minimum of 8 inches in circumference (2x2 box) and have a wall thickness of no less than .080 or a tube frame design with main rails of 1-3/4 OD tubing with a minimum wall thickness of .083. Front and rear sub-frames must be welded, not bolted to main frame rails. Six inch engine setback permitted measuring from base of number one spark plug to center of the upper ball joint. No torsion bar suspension.

2. ROLL CAGE - Roll bars to be a boxed frame, well braced of at least 1-1/2 O.D. steel pipe or tubing, with a wall thickness minimum of .080 DOM steel or .065 Chrome-moly tubing allowing for manufacturers tolerance. Driver's side must have a minimum of four protective sidebars, three protective bars on the opposite side of cage. Checking of wall thickness done by drilling a small check hole in the pipe or tubing.

3. Good brakes and shocks required on all four wheels, no plastic brake lines. Steel braided fuel lines recommended. Steel or aluminum wheels permitted, 14 inches maximum width excluding bead lock. Any type of upper or lower control arm may be used. Ball joint substitution is permitted.

4. Quick change rears permitted. Tru-track type rears permitted.

5. Fuel cell mandatory. Cell must be encased in an approved material. The cell should be located far enough front of the rear bumper and support bars to decrease the possibility of the cell being punctured in a crash.

6. Minimum weight of car and driver of 2375 pounds with a 25 pound tolerance after any event. The weight to be measured by Williams Grove Speedway scales. Maximum weight is 2900 pounds. Weight distribution of 60% left side maximum. Any bolt on weight must be in front of rear bumper. Must use 1/2 inch or larger bolt to fasten weight and weight must be securely fastened. No weight added above deck. Weight must be painted white and have the car number on weight.

7. An 11 inch HOOSEIR track tire is required. Tire must be stamped with HTMA on sidewall. HTMA stamp must be highlighted or marked. Permitted sizes are 88/11.0-15, 90/11.0-15, 92/11.0-15. Permitted compounds are D-15, D-35, D-45 and D-55.

BODY

BODY RULES AS PER NATIONALLY ACCEPTED LATE MODEL RULES

Any mid sized car body with a wheelbase of more than 100 inches originally may be adapted to the 103 inch frame. No subcompacts. No Pinto, Vega, Chevette type body. Stock steel body must remain stock appearing. After market body parts permitted. Limited use of lexan permitted. Lexan can be used for front roof supports and side panels of hatchback. Interior of car should allow for easy access to driver from either side of car and be clear of material or construction methods that could cause injury to the driver. No raised edges inside of car. Car must have a solid fire wall that meets approval of the technical committee.

Rear spoiler may have three 18 inch long solid supports no higher than 8-1/2 inches off the rear deck. Spoiler supports may not extend back beyond the rear edge of the spoiler. Roof side panels must be similar, symmetrical and the same length on both sides of car. Total front surface area of spoiler not to exceed 8-1/2 inches.

Body style and nose piece to match engine type being used.

ENGINES

1. Engines limited to 358 cubic inches.

2. Block must be a standard production block or approved after market block that was less than 358 cubic inches originally. No aluminum blocks. Chevy bow-tie block and Ford SVO block permitted.

3. Crankshafts must be factory production or stock dimension after market cast iron or steel crank Stroke must remain stock. Crank may be turned a maximum of .040 under. No swapping of cranks. Ford SVO crank with part number M6303-H351 permitted. MOPAR high performance crank with part number P4120312 permitted. All cranks must be a minimum of 46 pounds in weight. Penalty for using a light weight crank to be suspension for season in addition to penalties outlined in general rules.

4. RODS - A production rod from a V-8 engine under 358 cubic inches. Modification of rod length prohibited. Rods, block and crank to be used in the same combination that factory originally manufactured. Any stock dimension steel rod (No titanium) may be substituted. Stock dimension includes length, wrist pin location and journal size. Approved after market rod must be in factory condition, no polishing or reworking. No addition or removal of metal other than normal balancing. All 350 engines must have a 3/4 inch inspection hole in the left side of the oil pan opposite the number one rod journal. Any windage tray which would block the view of the rod must be removed. Ford permitted to use 6 inch length rod with SVO crank.

5. Flat top pistons only. Zero deck, piston may not be above the block.

6. Any factory steel head, or DART/ World Products Sportsman II steel head. DART/World Products head must have casting number of 1037. Heads must have a 60 cc minimum combustion chamber, no grinding in chamber. No aluminum heads. No relocating rocker arm studs. No porting or polishing. Matching ports in the intake port of head only. Depth maximum for matching ports is 3/4 of an inch. Lifter bore must remain stock. The valve seat area can be cleaned up using a maximum 80 degree grinding stone. No additional hand or machine work permitted. CC measurement of intake runner of head to remain stock with the exception of matching port. Vortec heads permitted with approved casting numbers of: Small port #25534351 and Large port #25534371. RHS ProAction cylinder heads permitted for Ford engines with approved part numbers #35301, #35302, #35303.

7. Production valve or production replacement, steel or stainless steel only. Any spring, any retainer permitted. Roller rockers permitted. Stock valve guide angle. No relocating valve guides.

8. Flat tappet cams only. No mushroom or roller cams.

9. Block must be cast iron. All factory identification numbers and/or part numbers must remain on crank and heads. Main bearing cap must be iron or steel.

GENERAL ENGINE SPECIFICATIONS

1. Maximum of four barrels of carburetion. Single carburetor only. No super chargers, fuel injection or turbo chargers.

2. Any approved intake other than a smoke ram or tunnel ram. Intake height to be a maximum of 8 inches measured from the top of the carburetor bowl using a straight edge from the bowl to the #3 or #4 runner of the intake manifold,

3. Balanced assemblies optional.

4. Must have a working clutch and starter. Multi-disc clutch permitted. Stock configuration clutch must have a full scatter shield of at least 1/4 inch thick steel or an approved bell housing. Failure to do so will result in an automatic suspension and loss of points.

5. Fuel - Racing gas or Methanol only. No additives of any kind including top lube. Methanol according to Federal Standards of Purity, Grade A or AA.

6. No electric fuel pumps or pressurized fuel systems. No inboard (in driver's compartment) fuel pumps.

7. Gear drive units permitted. No externally adjustable cam timing device.

8. Any battery ignition. No magneto.

9. No needle bearing cam, crank or rod bearings permitted.

10. No titanium rods.

GENERAL SPECIFICATIONS

1. Exhaust and steering system must pass safety inspection.

2. Battery to be safely secured and covered to meet safety requirements.

3. Racing type bumpers permitted, if bumper extends more than three inches outside of frame rails, then ends must be rounded and bumper must meet the approval of technical committee. Skid rails must be tight to the body except a kick out of skid rail permitted 18 inches in front of rear tire but may not extend past tread of any tire at any time.

4. Competitors should wear fire retardant driver's uniforms and gloves whenever driver is on the track.

5. Window nets on driver's side or arm restraints mandatory.

6. No driver adjustable weight jacks.

7.The driveshaft is to be painted white.

8. One way driver radios mandatory.

Team owned transponders mandatory in 2011. Transponder to be used is the rechargeable AMB Trannx 260.

THE ABOVE RULES ARE INTENDED TO BE A GUIDELINE IN CONSTRUCTING A CAR. THE DECISION OF TRACK OFFICIALS IS FINAL. CALL BEFORE YOU BUY OR BUILD.