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For the maximum street/strip LS1/LS2/LS6 aluminum cylinder heads AFRs all new 225cc emission legal head E/O #D250-4 are hands down the best choice. Specifically designed for 1997 to present Gen-3 Chevy Corvettes, Camaros, and trucks. AFRs LS1 head offers unmatched flow performance and features 2.080 intake and 1.600 exhaust valves with AFRs iron ductile interlocking valve seats. The 225cc is ideal for normally aspirated 396C.I. to 427C.I. For a wild 346 ci the 225 is a good choice, however some low RPM loss of torque might occur. It is available 72cc combustion chambers. AFRs LS1 is a direct bolt on, no special parts required. Structural features like Air Flow Researchs trademark 3/4 thick head deck, a must for blown and nitrous applications, reinforced rocker stud bosses and thick wall runners provide unparalled durability. An exclusive new modern combination chamber design with double quench pad area helps the LS1 generate huge low and mid lift airflow numbers. If you need a snake charmer for that pesky neighborhood Cobra Mustang look no further!

NOTE:

Hydraulic roller cams in "LS" Gen III engines typically experience valve float at 6600-6800 RPM's. If your plan on running over .600 gross valve lift and/or 6600 RPM, AFR suggest you upgrade your springs to AFR part #8019. Our upgrade spring has higher seat and open pressures (155/410+) to better reduce the risk of valve float in more aggressive applications.

THESE HEADS HAVE THE 8019 VALVE SPRING UPGRADE AT NO EXTRA CHARGE

• 255cc Intake Runner
• 2.08" Intake and 1.60" Exhaust Valves (NEW AFR 8mm Valves)
• 1.270" Diameter Springs - .600"+ Max Lift
• 100% CNC Ported Combustion Chambers
• 100% CNC Ported Exhaust Ports
• 100% CNC Ported Intake Ports
• 3-angle Raduised Valve Job
• 7 1.250 Titanium Retainers #8512
• 7 Valve Locks #9007
• Valve Seals #6612
• Spring Cups #8042
• Intake Valve Seats #9059
• Exhaust Valve Seats #9069
• Bronze Valve Guides #9051
• All Accessory Holes are Predrilled & Tapped!