Note:Technical Specs:
Alloy: Hypereutectic 390
Bore: 4.070''
Crankshaft Stroke: 3.310''
Connecting Rod Length: 6.123''
Deck Height: 9.599''
Compression Height: 1.840''
Pin Size: 0.9842''
Pin Location: Centered
Flat Top: -6cc 2V Relief
Intake Valve Relief: 0.286'' Depth / 2.200'' Diameter
Exhaust Valve Relief: 0.286'' Depth / 2.200'' Diameter
Top Landing Height: 0.305''
Ring Grooves: 5/64'' Top; 5/64'' Middle; 3/16'' Bottom
Gram Weight: 597/132
Compression Ratio: 10.9:1 w/57cc Heads; 10.5:1 w/60cc Heads; 10.0:1 w/64cc Heads; 9.6:1 w/68cc Heads