M311 LS3 Cylinder Head Rect-Port Assembled

Cylinder Head - M311 - Assembled - 2.165 / 1.600 in Valve - 273 cc Intake - 71 cc Chamber - Aluminum - LS3 - GM LS-Series - Each

M311 LS3 Cylinder Head Rect-Port Bare

Cylinder Head - M311 - Bare - 2.165 / 1.600 in Valve - 273 cc Intake - 71 cc Chamber - Aluminum - LS3 - GM LS-Series - Each