The RPM Xtreme for 361-440 big-block Chrysler 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 fully CNC ported 80cc combustion chamber, and then CNC ported in the bowl area (above the valve) for a smooth transition into the valve seats. The intake runner entries and exhaust runner exits are partially CNC ported for improved air-flow. RPM Xtreme big-block Chrysler heads maintain a 15° valve angle, stock exhaust port locations, and the spark plug angles have been modified to produce a smooth flame front for increased fuel efficiency and maximum power. Factory shaft mount rockers can also be used.

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