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I fail at the 4 mill build


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when you raise the exhaust port your motor will make power at higher rpm which also means less low rpm power . If your jugs are ported your exhaust was already raised and if you add another .040" you might have to get off and push the fucker to get moving :) shee'll rip your arms off up top though .

get a printable degree wheel from google , glue it to something solid ,bolt it to your crank and tell us how many degrees your exhaust is open

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