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375 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. Block Any cast iron block, OEM or Aftermarket, as long as it meets General Motors 350 ci., OEM specifications. No 400 Cubic Inch blocks may be used. OEM Lifter Bores Mandatory. OEM Cam location Mandatory. Block
Bore not to exceed: Chevy 350- 4.065. Splayed Main Caps are Allowable. Line Boring
is Allowable. Decking
is Allowable.
Crankshaft Strokes are
to be OEM and In-kind (no stroking or de-stroking). 350 GM
Stroke: 3.48 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, or
Aluminum. No Titanium Rods. Pistons Any Piston May Be Used, There Is no Compression
Limit. Camshaft and Timing Chain Camshaft
shall be any OEM style hydraulic or solid
lifter cam. No mushroom
or roller style cams allowed. Lifters must
be OEM stock size. No belt
or gear drives allowed. OEM style
chain drives only (double roller acceptable).
Oiling System Any Wet
or Dry Sump system Allowed . External oil coolers are Allowed. Remote oil
Filters Allowed. Cylinder Heads Any Cast Iron OEM
Head Allowed. Bowtie Heads Allowed(Cast Iron Only). No Porting Or Port Matching of any kind on either heads or intake
manifold. Heads
may be Milled on Deck Surface Only. No Acid porting or Spray welding may be performed. Roller Rockers
are permitted. Ratios are as follows: Chevy-1.60,
Ford-1.60, Chrysler-1.60 Shaft Rockers are Allowed. Dual Coil
valve springs are permitted. Any Valve Keepers or Retainers May Be used. Screw In Studs
and Stud Girdles are Permitted. Part numbers for Approved Aftermarket Heads:
World Products
Dart Heads
#955-011150A
#301-10310010
#955-011250A
#301-10320010
#301-10311111
#301-10311112
#301-10321111
Valves Type
Intake
Exhaust Rocker Arm Ratio Chevy 2.02
1.60
1.60 FordC 2.04
1.71
1.60 FordW 1.94
1.60
1.60 Chrysler 2.02 1.60
1.60 AMC
2.02
1.60
1.60 Valve Stem must
be stock OEM Diameter. Pro-Flo
and Stainless Steel Valves are Allowed. No Titanium Valves. Carburetion Any Carburetor may be used with any Intake Manifold. No Tunnel Rams. 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. Transmission or Direct Drive Allowed (must be
1 to 1 ratio.). ==================================================== |