Keith Black Hypereutectic Pistons, Pontiac 455, 4.210" Str., 4.180" Bore (+.030"), -30.5cc Step Dish, Set/8, UEM-KB371-030

Keith Black Pistons — Pontiac 455

4.180" Bore (+.030") · 4.210" Stroke · -30.5cc Step Dish · Set of 8

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 is 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.

Specifications

What You Get

• Eight Keith Black hypereutectic pistons
• .980" x 3.000" wrist pins and locks

Fitment & Installation Notes

• Keith Black hypereutectic pistons require a much wider top ring end gap than traditional forged pistons. The KB spec is 0.0065" per inch of bore for a street engine.