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Serious performance upgrade for street, mild bracket racing and oval track racing. Maximum torque and throttle response from idle to 6,800 RPM. Best for 347-427 cubic inch engines. Works with most standard components. PRO1 20 Deg 195cc Aluminum cylinder heads feature increased airflow for larger engines and higher RPM usage. Standard valve angle and spacing is retained for bolt on compatibility. Exhaust runners are raised .135 in. for improved flow. Manganese Bronze valve guides are used for long life, and hardened valve seats provide durability with unleaded fuels. Features both 2.500 in. and 3.000 in. exhaust bolt patterns. Assemblies include Stainless Steel valves, premium springs, locks, retainers, studs, guide plates and seals.
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