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.
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