Cylinder Head - Pro 1 LS1 - Bare - 2.050 / 1.600 in Valves - 225 cc Intake - 62 cc Chamber - Angle Plug - Aluminum - GM LS-Series - Each

Cylinder Head - LS3 Mongoose - Assembled - 2.165 / 1.600 in Valves - 260 cc Intake - 69 cc Chamber - 1.270 in Springs - Angle Plug - Aluminum - GM LS-Series - Pair

Cylinder Head - Assembled - 2.165 / 1.590 in Valves - 260 cc Intake - 68.4 cc Chamber - 1.290 in Springs - GM LS-Series - Each

Cylinder Head - Bare - 2.281 in / 1.744 in Valve - Angle Plug - Aluminum - GM LS-Series - Each

Cylinder Head - Bare - 2.277 in / 1.738 in Valve - 257 cc Intake - Angle Plug - Aluminum - GM LS-Series - Each

Cylinder Head - LS3 Mongoose - Assembled - 2.165 / 1.600 in Valves - 260 cc Intake - 69 cc Chamber - 1.270 in Springs - Angle Plug - Aluminum - GM LS-Series - Pair