Canted Valve LS1 Head 6 Bolt Porters Casting

High-performance bare casting cylinder head for LS engines. Features innovative canted valve design (intake 5° rotated, exhaust 3°) to optimize valve unshrouding and sizing, achieving over 360 CFM intake flow at 0.650" lift with BTR's port program. Incorporates NASCAR-proven canted valve technology into the LS platform. Compatible with Gen 3 & 4 LS1 pedestal-type rockers/bolts, standard LS valve covers, and intake/exhaust manifolding. Utilizes Gen V LT valves, spark plugs, and valve spring packages for straightforward assembly with OEM-compatible parts. As a 'porter's casting,' it ships partially machined with finished valve guides but unfinished valve seats; requires professional machining (material removal from chambers/runners, deck milling, valve seat cutting/finishing) before use. Verify all engine clearances.