I-88 Speedway Sportsman Engine Rules

The Sportsman engine rules for I-88 Speedway are listed on this page.

Forms: [Driver Sponsor Sheet] [I-88 Speedway License]

SPORTSMAN ENGINE

[Engine Specs] [Cylinder Heads] [Rods] [Crankshaft] [Pistons] [Vibration Dampeners] [Camshaft] [Intake Manifold] [Carburetor] [Ignition] [Lubrication System] [Water Pump] [Fuel Pump] [Fuel] [Crate Engine] [PDF of Sportsman Engine Rules] [Download Adobe Acrobat]

Engine Specs:

This class is reserved for North American passenger car V-8 engines with stock OEM cast iron block and heads.

  1. Normally aspirated engines only.
  2. All engine parts must have casting or part numbers on them for identification.
  3. All engines must maintain stock bore and stroke combinations.
  4. The engine block and all internal parts must meet stock specifications for its make.
  5. May use: Chevy Bow-Tie block #10185047 or Dart #31161111, Ford Dart # 31364175 or Dart "Little M" sportsman block # 3115111. All must meet stock specifications.
  6. May use: Factory sealed GM crate motor # 88958602.
    • Engine maximum overbore cubic inches (C.I.). Plus 4 C.I. allowance for wear.
      • GM Crate - 4.00" bore x 3.480" stroke 350.
      • Chevy 350 - 4.00" bore x 3.480" stroke + .070" 363 C.I.
      • Ford 351 - 4.00" bore x 3.500" stroke + .060" 363 C.I.
      • Chrysler 360 - 4.00" bore x 3.578" stroke + .020" 364 C.I.
      • Chrysler 340 - 4.04" bore x 3.313" stroke + .060" 350 C.I.

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Cylinder Heads:

  1. Stock cast iron OEM American passenger car cylinder heads.
  2. Chevy bow-tie, Dart 180 or 200, Chrysler W-2 and Ford competition heads are permitted. All identification numbers must be visible and unaltered.
  3. Chevy Vortec and Ford GT 40 heads are not allowed.
  4. Factory valve spacing and angles must remain unaltered.
  5. NO aluminum heads.
  6. All heads must pass ball test.

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Rods:

  1. OEM stock production or aftermarket solid steel rods only.
  2. Rods may NOT be polished.
  3. NO titanium, aluminum or billet rods permitted.
  4. Rod type must match engine type. Chevy in Chevy, Ford in Ford and Chrysler in Chrysler.
  5. Rod lengths must be OEM specs for engine block. Chevy 5.7", Ford 5.956" and Chrysler 6.125".

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Crankshaft:

  1. Any steel or cast iron crankshaft is permitted providing it maintains stock stroke as manufactured for the engine block used.
  2. Aftermarket OEM replacement crankshafts with holes drilled through crankpins are permitted providing they maintain stock specifications and appearance.
  3. NO lightweight crankshafts permitted. 52lb minimum weight.
  4. The minimum rod and main journal sizes must be manufacture specifications less factory undersize.
  5. Knife-edging, narrowing or cutting down the diameter of the crankshaft counter weights is not permitted.
  6. NO polishing of the crankshaft.

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Pistons:

  1. Any brand three ring flat top aluminum pistons.
  2. No coating of any kind permitted.

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Vibration Dampeners:

  1. Any steel or cast iron, stock OEM or aftermarket vibration dampener is permitted providing it is not machined or altered in any way.
  2. No fluid or friction dampeners are permitted.

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Camshaft:

  1. Any make hydraulic or flat tappet camshaft is allowed.
  2. No roller cams, roller gear driven cams, mushroom lifters or lash caps are allowed.
  3. Shaft rockers and stud girdles are not allowed.
  4. Engines with stock OEM shaft rockers are allowed.
  5. Roller rockers with optional ratios are allowed.
  6. Lifters must maintain stock OEM diameters.
  7. Lifter bores must remain in stock OEM positions and angles, but may be rebushed for wear.
  8. A flat steel lifter galley plate may be used to prevent engine damage in case of push rod failure.

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Intake Manifold:

  1. OEM stock cast iron 2 barrel intake manifold permitted.
  2. Optional aluminum 4 barrel spec manifold may be used:
    • Chevy 350 - Brodix # HV1011
    • Ford 351 - Edelbrock # 2981
    • Chrysler 340 - Edelbrock # 2915
    • Chrysler w/W-2 heads # 2920

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Carburetor:

  1. Any American stock OEM 2 barrel carburetor with up to 1-11/16" throttle bore with no adapter plate is acceptable on 2 barrel cast iron manifold.
  2. Holley carburetor # 4412 may also be used. Spacer adapter of no more then 1-1/16" including gasket.
  3. Adapter may not be ported, tapered or altered in any way.
  4. No modifications of any kind will be permitted to these carburetors except those listed below (box stock only).
  5. Conventional round type air cleaners. No type of ram air allowed.
  6. Air cleaners that provide ventilation through the top cover (such as K & N brand) are permitted.
  7. No air induction plastic carburetor inserts or other devices to direct air into intake are permitted.
  8. No air diffusers are permitted.
  9. Modifications that will be permitted, any other modification will NOT be permitted:
    • Holes drilled in the throttle plates for proper idling.
    • Drilling, tapping and plugging of unused vacuum ports.
    • Welding or throttle shaft to linkage arm.
    • Drilling of idle or high speed air correction jets.
    • Milling of center carburetor body metering block surface a max. of .015" on each side.
    • Removal of choke plate and shaft.
    • Jets may be changed as needed.

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Ignition:

  1. Distributor must be stock OEM or stock type aftermarket.
  2. Stock OEM or stock type aftermarket coil and module.
  3. No trigger ignition.
  4. On H.E.I. ignition systems coils must remain in the stock location and system must remain as manufactured.
  5. Must maintain OEM firing order.
  6. Only one (1) coil allowed on car.
  7. Only one (1) 12 volt battery permitted.
  8. No step up transformer or any other device that increases voltage allowed.
  9. No traction control devices or form of braking devices that controls traction allowed.

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Lubrication System:

  1. No dry sump systems allowed.
  2. Steel oil pans only.
  3. The oil pan must have a 1" inspection hole on the left side for checking connecting rods.
  4. No external oil pumps or Accu-sumps allowed.
  5. No form of engine evacuation system by internal or external driven pumps or by connection between exhaust system and valve covers, intake manifold or oil pan allowed.
  6. Maximum two breathers per valve cover.
  7. Oil coolers are permitted providing they are mounted under the hood or under the left wing panel.

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Water Pump:

  1. Water pump must be cast iron.
  2. Radiator fan must be steel.
  3. No electric cooling fans or pumps allowed.

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Fuel Pump:

  1. Must remain in stock location for make engine.
  2. Must be driven as stock OEM equipment.
  3. No electric fuel pumps allowed.

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Fuel:

  1. Racing or pump fuel only.
  2. No nitrous or any other fuel additives.
  3. All fuel subject to random testing.
  4. Any infraction of the engine or fuel specifications as mentioned above may result in disqualification, suspension and/or fines.

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Crate Engine:

  1. May use GM factory sealed crate engine # 88958602.
  2. Engine must remain as manufactured by GM.
  3. Engines may not have GM factory seals tampered with. Anyone found tampering with a crate engine may be disqualified, suspended or have to run by open rules.
  4. Distributors must remain stock as supplied by GM (unaltered in any way).
  5. Only GM replacement valve springs may be used # 10212811.
  6. One Holley 650 cfm carburetor required. Only # 4777 and # 80777 are permitted.
  7. Carburetor must remain in stock form. Exceptions for modifications listed under open carburetor rules.
  8. A maximum 1" unaltered single hole spacer plate is allowed.
  9. Must maintain stock venture and throttle bore dimensions. Primary 1-1/4", Secondary 1-5/16".
  10. Must pass carburetor go/no-go gauge measurements.
  11. Track Tech inspector must be notified before any work is done to a crate engine and all work must be documented.

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