Chevy GM LS3 L92 L76 250cc 64cc 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.