NEW PROCOMP SB CHEVY BARE ALUMINUM 190CC CYLINDER HEADSCALL SHANON AT 507 445 3235 WITH ANY QUESTIONS. SEE OUR EBAY STORE FOR LOTS MORE HEADS. New set of Aluminum Small Block Chevy Bare Pro Comp Motorsport Heads (2 heads) Produce As Much As 450 HP Out Of Box With Advanced Port Design Just do a nice bowl blend 190cc Intake Runners 64cc Chambers STRAIGHT AND ANGLE PLUG AVAILABLE. LET US KNOW WHICH TYPE YOU WANT. Bronze Valve Guides Premium Hardened Seats 2. 02 and 1. 60 valve seat size CUSTOM BUILD COMPLETE