The RPM Xtreme for small-block Chevy is an all new design that is CNC ported where it counts to achieve optimal air-flow for maximum horsepower and torque in high performance street and light duty racing applications. The casting and port design are all new and engineered to be as close to perfect as possible. To ensure consistency from port to port, the RPM Xtreme is treated to a fully CNC ported 64cc combustion chamber, and then CNC ported in the bowl area for a smooth transition into the valve seat. The intake runner entries and exhaust runner exits are partially CNC ported for improved air-flow. RPM Xtreme small-block Chevy heads maintain the stock 23° valve angle and the intake flange is drilled to accept 1986 and earlier intake manifold designs.

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