Description
Keith Black Hypereutectic pistons are a great choice for high performance marine, drag race, circle track, street or towing application builds. The low expansion 390 alloy with 16 percent silicon allows for a tighter piston to wall running clearance.
Fully machined head and valve reliefs
Triple Spiral Lock Rings
CNC machined pin bores produce straight and accurately sized bores
Accumulator Groove aids with compression ring seal
Machined in Oil Returns
Diamond Finished Skirts
Mini Grooves to reduce scuffing and overheating
Wrist pins and spiral lock included
1/16 x 1/16 x 3/16 rings not included
Compression Ratio 55cc 12.7:1, 60cc 11.9:1, 64cc 11.3:1, 69cc 10.6:1
Advertised piston weight 647 grams, 143 gram wrist pin
OE Deck Height 9.500″
Note: Standard bore size is 4.000
Note: Centered Pin. Pre-71 blocks .020 shorter, not enough stock to clean up
