For the maximum street/strip LS1/LS6 aluminum cylinder head AFR's all new 225cc, emission-legal head E/O #D250-4 is the best choice. Specifically designed for 1995 to present Gen-3 Chevy Corvettes, Camaros, and trucks, AFR's LS1 head offers unmatched flow performance and features 2.080 intake and 1.600 exhaust valves with AFR's iron ductile interlocking valve seats. The 225cc is ideal for normally aspirated 396ci to 427ci. For a wild 346ci, the 225 is a good choice, but some low RPM loss of torque might occur. It is available with 72cc combustion chambers. An affordable as-cast version is also available. AFR's LS1 is a direct bolt-on, no special parts required. Structural features like AFR's trademark 3/4" thick head deck, a must for blown and nitrous applications, reinforced rocker stud bosses, and thick wall runners for durability. An exclusive modern combustion chamber design with double quench pad area helps the LS1 generate huge low and mid lift airflow numbers.

225cc Intake Ports - 62cc & 72cc Combustion Chambers Big Bore - 85cc Exhaust Ports - 155 lbs Seat Pressure - .650" Max Lift

Requires The use of 1999-later center bolt valve covers * All accessory holes are pre-drilled & tapped * Sold In Pairs

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