Chevy GM LS1 LS2 LS6 225cc 64cc Full CNC Aluminum Bare Cylinder Head

Unlike most other Chevy V-8’s, the LS-series engines utilize individual O-rings around each port to seal the intake manifold to cylinder head. The LS1 / LS2 / LS6 style heads & manifolds use GM pn# 12533587 and the LS3 / L76 / L92 style heads use GM pn# 1290125.