Charlie made over 700 HP with 4 cylinders and 200 cubic inches of displacement. This was factory cast iron block parts upgraded to be stronger. Lower boost and proper machining and a street/strip pontiac block around 3.75 stroke
should be fine. Charlie also ran factory 4 cylinder cranks but at much higher boost levels vs what we are talking about here.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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