For the maximum street/strip LS1/LS6 aluminum cylinder head AFR's all new 225cc emission legal head E/O #D250-4 are hands down 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. For a wild 346 ci the 225 is a good choice. AFR's LS1 is a direct bolt on, no special parts required. Structural features like Air Flow Research's trademark 3/4" thick head deck, reinforce rocker stud bosses and thick wall runners provide unparalleled durability. An exclusive new modern combination chamber design with double quench pad area helps the LS1 generate huge low and mid lift airflow numbers.
Note: Hydraulic cams in LS Gen III engines typically valve float at 6600-6800 RPM's. Our upgrade spring has higher seat and open pressures. AFR also recommends the use of Comp "R" lifters in conjunction with our 8019 spring upgrade.