For Big Block Chevy 454 Rectangle Port Bare Aluminum Cylinder Head 124cc 345cc

--Big Block Chevy Performance Aluminum Cylinder Heads

--Features Angle Spark Plug

--Rectangle Intake Ports 345cc Runner 124cc Combustion Chamber

--Accepts 2.300 Intake Valve 1.88 Exhaust Valve

--Package: Including All Items In The Picture.

Note: Professional Installation Is Highly Recommended. (No Instruction Included)