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RPM XTREME
The RPM Xtreme for big-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 combustion chambers, and 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 Chevy heads have a 25° 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. Two port designs are offered, a 300cc oval and 325cc rectangle and the rectangle port is offered in two combustion chamber sizes, 110cc and 118cc. All RPM XT heads are equipped with high-quality valve springs for valve lifts of up to .700". Made in the USA for absolute quality and performance.
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RPM XTREME OVAL PORT
- Chamber shape completely machined (CNC ported)
- Valve bowls and gasket area CNC ported
- 25° valve angle
- 112 cc* chamber
- 308cc left-hand / 325cc right-hand intake ports with 2.25" diameter valves
- 133cc exhaust ports with 1.88? diameter valve
- Unique spark plug angles and location
- Recommended for use on 4.250" and larger bore size
- Made in the USA
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| RPM Xtreme Big-Block Chevy (Oval Port) |
| Chamber Size |
Intake Port Size |
Valve Sizes (in/ex) |
Bare (single) |
Complete (single) |
| 112cc |
308cc (lh) / 325cc (rh) |
2.25"/1.88" |
N-a |
51459 |
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RPM XTREME RECTANGULAR PORT (SMALL CHAMBER)
- Chamber shape completely machined (CNC ported)
- Valve bowls and gasket area CNC ported
- 25° valve angle
- 110 cc chamber
- 348cc left-hand / 356cc right-hand intake ports with 2.300" diameter valve
- 145cc exhaust ports with 1.88" diameter valves
- Unique spark plug angles and location
- Recommended for use on 4.250" and larger bore size
- Made in the USA
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| RPM Xtreme Big-Block Chevy (Rectangle Port) Small Chamber |
| Chamber Size |
Intake Port Size |
Valve Sizes (in/ex) |
Bare (single) |
Complete (single) |
| 110cc |
348cc (lh) / 356cc (rh) |
2.30"/1.88" |
N-a |
51539 |
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RPM XTREME RECTANGULAR PORT LARGE CHAMBER
- Chamber shape completely machined (CNC ported)
- Valve bowls and gasket area CNC ported
- 25° valve angle
- 118 cc chamber
- 344cc left-hand / 352cc intake port with 2.300" diameter valves
- 142cc exhaust ports with 1.88" diameter valves
- Unique spark plug angles and location
- Recommended for use on 4.250" and larger bore size
- Made in the USA
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| RPM Xtreme Big-Block Chevy (Rectangle Port) Large Chamber |
| Chamber Size |
Intake Port Size |
Valve Sizes (in/ex) |
Bare (single) |
Complete (single) |
| 118cc |
344cc (lh) / 352cc (rh) |
2.30"/1.88" |
N-a |
51559 |
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AMC
Small Block
