CHEVY LS -3.2CC FT 1.304 X 3.903

Wiseco K398X3903 pistons are designed for GM LS1 engines with a 3.903" bore, 3.622" stroke, and 6.125" connecting rods. These flat-top pistons have a -3.2cc dome volume and are made from 2618 high-strength forged alloy. They feature ArmorGlide skirt coating, anti-detonation and pressure seal grooves, and come with premium piston rings (1.2, 1.2, 3mm). A pin upgrade is recommended for applications exceeding 700HP. They are compatible with LS1, LS2, LS3, LS6, and LS92 valve pockets and can be used with naturally aspirated, boosted, or nitrous setups. The compression ratio is 9.9:1 with 67cc heads and 9.8:1 with 68cc heads.