LS1 200cc Intake Aluminum Cylinder Head

The GM Genuine Parts 12564241 is an aluminum cylinder head, commonly referred to by its casting number 241. This head is designed for the LS1 5.7L Passenger Car engine and was manufactured for the 2001-2003 model years. This cylinder head features a cathedral port design, characteristic of LS1, LS6, and LS2 engines. It has an intake port volume of 200cc and an exhaust port volume of 70cc. The combustion chamber volume is 66.67cc, contributing to a 10.1:1 compression ratio. The intake valve diameter is 2.00 inches, and the exhaust valve diameter is 1.55 inches. Interchangeability of LS engine heads requires careful consideration of intake manifold port configurations and block bore sizes to prevent valve-to-block interference. The LS1 and LS6 engines, with their 3.89-inch bores, can only use LS1, LS6, and LS2 heads.