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Old 07-24-2020, 12:56 PM   #37
flatheadmurre
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Join Date: Apr 2015
Location: Sweden
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Default Re: Let's build a drag race 8BA engine

I never use a 4-bolt main on a flathead...either toolsteel 2-bolt main cap with ARP bolts or a wide main cap bolted to the panrail.
Anything drilled into the center mainweb is a startingpoint for a crack and a failure.
And if you´re building a performance motor you want to make sure main bore is perfectly straight...friction and flexing crankshafts is not doing you any good.
The only thing that is certain about bobweight calculation is that there is no consensus among engine builders regarding the benefits of over- or underbalancing a crankshaft...you ask 10 and you get a dozen different answers...
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