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Do valve spring for sure. These motors like to throw rocker arms through the valve cover when they float around on the rev limiter with stock springs. 10:1 is a good all around cr for e85 or 93 (or equivalent) fuel. Does the avo stage 3 have the slightly larger turbo wheel? I used to make 400/350 on e85 with the base avo kit at 18ish psi
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