Specs from Tom himself. I don't know if this was for a stock stroke or 4mil though. The rockets are a pretty decent pipe, but to get them to rev, they need a fairly brutal exhaust duration. On my 4mm, it actually didn't seem to hurt the bottom end much going from a 196-200*, but it really let it charge up top. Same motor with shearers obviously revved out better up top, but had no where near the bottom end as the same combo with rockets.
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