PMI 243+ LS Cath cylinder head's 215cc

Powell Machine Inc® precision cast cylinder heads are made from tough A-356 aluminum alloy and feature Permanent Mold "As-Cast" technology. Port accuracy is unrivaled--meaning CNC porting is not required to provide superior flow. The result is CNC-ported performance at a fraction of the price!
 
We start with precision CNC-finished faces and bolt holes for accuracy and fitment. American craftsmen expertly size and install the manganese bronze valve guides and interlocking ductile iron seats before finishing with a competition-grade valve job. From there, the decks are given a final pass for superior finish.
 
They are finish-assembled in the USA with top-quality components like PAC Racing springs, ARP fasteners, one-piece 21 4N stainless valves, machined locks, Viton® seals and chromoly steel retainers.
.200 146/123
,.300 195/158
.400 237/191
.500 264/212
.600 268/225
 
The end result is the performance you want and Powell Machine™ quality you TRUST!