For Gen 4 blocks (see description for details)
Fits (with GM LS9-style squirter machining): LS2, LS3, LS7, LS9, LSA, L76, L92, L99, LSX.
Does NOT fit: LS1, LS4
LS6, C5-R, RHS (use Katech RHS squirters).
Designed for 3.622" stroke.
For 4.000" stroke engines use KAT-A5144
May require some piston skirt clearancing depending on piston design
Requires block machining to install