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  1. Propellers
    Hi I'm racing a GM-Holden powered 202ci 6cyl centre mount. My engine is should be making power well into the 6000's rpm it has 11.5:1 comp, [email protected] comp cam, and a holley 570 4bbl. I'm running an 11x12 cupped prop (3blade) and achieved my best speed of 56.5 gps/mph @5300rpm I tried reducing the...