Recommended for more aggressive street or street/strip big block chevy applications with displacements up to 540 cubic inches, operationg at or below 6800 RPM. The 325cc magnum cylinder head intake runners and exhaust ports are partially CNC machined, while the combustion chambers are offered with partial or full CNC machining with a bowl blend. Capable of flowing 390 CFM at 0.700 of lift.

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