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It's not your heads keeping the HP that low, although a 215 head would produce more HP something else is holding you back. Both the heads and intake can support HP higher than what would be about 440HP at the FW according your RWHP number. You could use more duration on the cam. Gaz64 is on to something. Listen to him. Small exhaust will kill that 418. I tried to different style dyno's and they were 30HP apart. The Dynojet gave the higher number
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Lou
Last edited by RET_COP; 01-16-2020 at 02:06 PM..
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