PRI 2017: Frankenstein Engine Dynamics New P48 Evolution Hemi Heads

The Chrysler Hemi engine has a reputation for being a powerhouse capable of producing big horsepower with little effort. Frankenstein Engine Dynamics has mastered the art of coaxing hidden horsepower out of the traditional Hemi design, but now they are taking things to a new level with their P48 Evolution Hemi cylinder heads.

The P48 started as a totally blank slate for Frankenstein since they wanted to address the shortcomings of the traditional Hemi cylinder heads. With this new design, Frankenstein raised the intake and exhaust ports to start with. The P48 also has a smaller 85-88cc sized combustion chamber, that combined with the raised runners allows for a more efficient burn in the cylinder. The rocker arm geometry has also been redesigned to allow for the use of 9/16 straight push rods, and helped reduce deflection to zero.

Taking something that has worked so well for so long and reinventing it is no small task. According to Chris Frank from Frankenstein, the design changes to the P48 cylinder heads work together to form a great final product.

“Since the ports are raised, it makes the heads more efficient, allowing a racer to rev the engine higher, and be able to sustain those RPMs without having valvetrain issues. The rocker system was a big focus when we designed this head to get rid of the standard Hemi issues. We have moved valve locations and angles to make those rocker system changes work well. As part of the rocker system improvement process, we worked with Reid to make sure everything would be bomb proof.”

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About the author

Brian Wagner

Spending his childhood at different race tracks around Ohio with his family’s 1967 Nova, Brian developed a true love for drag racing. When Brian is not writing, you can find him at the track as a crew chief, doing freelance photography, or beating on his nitrous-fed 2000 Trans Am.
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