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tubman · 03-04-2026, 04:15 PM

How do these numbers (375, 400, 425) translate into compression ratios? How does the bore and stroke fit in? Is there a formula one can plug these number into?

I always thought it was the camshaft lifts they would accommodate. In that context those numbers make sense, given the lifts of various flathead cams range from a stock 8BA lift of .307" to a Schneider 270F at .425".

03-04-2026, 04:15 PM	#12
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 12,148	Re: Weiand cheater heads alu How do these numbers (375, 400, 425) translate into compression ratios? How does the bore and stroke fit in? Is there a formula one can plug these number into? I always thought it was the camshaft lifts they would accommodate. In that context those numbers make sense, given the lifts of various flathead cams range from a stock 8BA lift of .307" to a Schneider 270F at .425". Last edited by tubman; 03-04-2026 at 08:34 PM.