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Originally Posted by 253
(Post 4247649)
No , you have way more than 350 HP. each engine if running 77 on gps w/ 4 people,,more like 425-450 hp each, an HP. 500 is 485hp,,, FIVEPTOHH , is running 496'S, and you are same as him on speed, what is compression on each now compared to leak down., and what brand props are you running, reworking the heads will help, and maybe the props need worked also.
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If your new engines are 580 hp you will probably be in the 83-84 range, good luck
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