Description

These Buick 401 Nailhead Pistons are a replacement cast aluminum 4.1875 inch bore piston set for the 1959-1966 Buick 401 Nailhead engine. Cast from high-silicon A-332 aluminum alloy and machined on modern CNC equipment, the Buick 401 Nailhead Pistons are precision balanced and weight-matched within 8 grams from lightest to heaviest for a smooth, dependable Nailhead rebuild.

Replacement cast aluminum 4.1875″ bore piston set for ’59-’66 Buick 401 Nailhead.

Cast from high silicon A-332 aluminum alloy
Machined on modern CNC machinery
Precision balanced & weight-matched sets
Balanced to within 8 grams from the lightest to the heaviest piston
The 401 rings are a cast top, and a cast second ring.