Cylinder Head - LSx Mongoose - Assembled - 2.020 / 1.600 in Valves - 215 cc Intake - 65 cc Chamber - 1.290 in Springs - Angle Plug - Aluminum - GM LS-Series - Pair

Cylinder Head - LSx Mongoose Street - Assembled - 2.080 / 1.600 in Valves - 230 cc Intake - 72 cc Chamber - 1.270 in Springs - Angle Plug - Aluminum - GM LS-Series - Pair

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

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

Cylinder Head - Performer RPM - Assembled - 2.110 / 1.660 in Valves - 215 cc Intake - 72 cc Chamber - 1.460 in Springs - Angle Plug - Aluminum - Pontiac V8 - Each

Cylinder Head - Performer RPM - Assembled - 2.110 / 1.660 in Valves - 215 cc Intake - 87 cc Chamber - 1.460 in Springs - Angle Plug - Aluminum - Pontiac V8 - Each