Powermax is a custom built cyl for a BB kit with a sled reed cage and power valve added. It's strictly a drag engine. 300ft sand drags. Aaen also has a version. HPD made the PM.
Mot of us run trail mod engines in the 55-65 range maybe 70 with a stroker. A race mod is like 70-80 maybe 85hp. The diff in these is the pipe and ports
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