Keith Black Hypereutectic Piston and Ring Kit, Pontiac 428, 4.000" Str., 4.180" Bore (+.060"), -6cc Flat Top, Set/8, UEM-KB304KTM-060

Keith Black Pistons & Rings — Pontiac 428

4.180" Bore · 4.000" Stroke · -6cc Flat Top · Set of 8 with Rings

Keith Black hypereutectic pistons are the long-running standard for a stock-to-mild Pontiac rebuild. The high-silicon casting runs tighter piston-to-wall clearance than a forging, so it's quiet cold, seals well, and holds oil control for a long street life. It is not a power-adder piston — but for a numbers-matching rebuild or a mild cam and headers combination, it is the right part at the right money.

This kit is a complete set of eight Keith Black hypereutectic pistons for a Pontiac 428 on a 4.000" stroke, finished at 4.180" (+.060"), supplied with the matching 5/64, 5/64, 3/16 ring set so the ring pack and the groove are right the first time.

Specifications

What You Get

• Eight Keith Black hypereutectic pistons
• Matched 5/64, 5/64, 3/16 ring set
• .980" wrist pins and locks
• Sold as a complete set — Butler does not break these into singles