315 Cubic Inch SKIFF

            If anyone has a question or needs an explanation about any rule in this class, refer to the engine Committee for verification. Every engine must have two intake bolts drilled (across from each other) for sealing purposes. Note: The Engine committee will be the determining party on a protest as to the legal status of any engine. No V-Drives

Block

Block must be stock OEM cast iron with a bore not to Exceed 315 CID. 

OEM Lifter Bores Mandatory.

OEM Cam location Mandatory.

Splayed Main Caps are Not Allowable.

Line Boring is Allowable.

Decking is Allowable, average Deck Height to be Zero or Less.

Block Bore Specs:                         Oversize

            Chevy 305-307                    .030

            Chevy 283                          .060

            Ford 289                            .060

            Ford 302                            .030

            AMC 304                           .030

            Mopar 273                         .060

Crankshaft

            Strokes are to be OEM and In-kind to selected block (no stroking or de-stroking).

Aftermarket Crankshafts meeting OEM Specifications Allowed.

Journal Sizes must meet OEM Requirements and can be cut up to 0.040 under OEM Standard.

Drilling for oil will be Allowed.

Balancing will be Allowed.

No Ultra Light, No cut down, No knife-edge, must be stock in appearance.

Crankshaft must be cast iron or steel, No Titanium.

Connecting Rods

Connecting Rods may be OEM or Aftermarket, with OEM or aftermarket rod bolts.

Connecting Rods must be of Stock OEM Length measured center to center and contain an OEM Rod Journal Bore for Block being used.

Connecting Rod pinhole may be bushed.

Connecting Rods may be Steel, Sportsman.

No Titanium Rods.

No Aluminum Rods.

Pistons

            Pistons must be Cast or Forged, minimum Weight 475 grams (without pins).

305cid Chevy minimum Piston weight 420 grams.

Pin weight minimum 100 grams.

Flat Top Pistons may have Two Valve reliefs.

Any Three ring combo Allowed.

Reversing of pistons Allowed

Camshaft and Timing Chain

Camshaft shall be any OEM style, Hydraulic Only.

No mushroom or roller style cams allowed.

Hydraulic Lifters Only (lifter must function hydraulically with 0.050 min. piston travel).

Lifter must be OEM stock size.

No belt or gear drives allowed.

OEM style chain drives only (double roller acceptable).

Oiling System

Any Wet Sump system Allowed .

External oil coolers are Allowed.

Remote oil Filters Allowed.

No Dry Sumps.

Cylinder Heads

Any Cast Iron OEM  Head Allowed.

No Bowtie, SVO, Direct connection, No Aftermarket Heads Allowed.

Heads must be within 7% of OEM  C.C.

No Porting Or Port Matching of any kind on either heads or intake manifold.

Heads may be Milled on Deck Surface Only(up to 0.020Maximum).

No Acid porting or Spray welding may be performed.

Roller Rockers are permitted. Ratios are as follows: Chevy-1.50, Ford-1.60, Chrysler-1.60

Shaft Rockers are Not Allowed.

Dual Coil valve springs are permitted.

Any Valve Keepers or Retainers May Be used.

Screw In Studs and Stud Girdles are Permitted.

Valves

            Type                Intake               Exhaust                        Rocker Arm Ratio

            Chevy              1.84                 1.50                             1.60

            Ford                1.84                 1.55                             1.60

            Chrysler          1.88                 1.50                             1.60

AMC               1.88                 1.50                             1.60

Valve Stem must be stock OEM Diameter.

Swirl Finish Allowable

Pro-Flo and Stainless Steel Valves are Allowed.

No Titanium Valves.

Carburetion

Any Carburetor UP TO = 750 CFM may be used with any Intake Manifold.

No Tunnel Rams.

Venturies are to be OEM with no Polishing or Modifying Allowed.

Over sizes Jets and Power Valve Modification will be Allowed.

Removal of  Choke Butterfly and related hardware Allowed.

Removal of Air Horn Not Permitted.

No Porting or Match Porting Allowed.

No Acid Porting or Spray Welding Allowed.

No Sheet Metal Intakes Allowed.

Wedge Specifications and Valve Job Sheet Attached.

Ignition

Any OEM or Aftermarket Distributor, Coil, HEI, or MSD type Allowed.

No Magnetos Allowed.

Miscellaneous Specifications

Any Gasoline type Fuel, Example Fuels: VP, CAM 2, Torco, Sunoco.

No Fuel Additives Allowed.

Fuel Injection, NOS, Propane, Oxygen, and Alcohol are Not Permitted.

Any Wet Exhaust is Allowed.

Any Starter Fly Wheel Combo Allowed.

Block Filler In Cooling System is Allowed.

Any Mechanical Or Electric Fuel Pump Allowed.

Oil restrictor and screen kits Allowed.

Direct Drive Prop System Only Allowed.

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