Here's a picture of what the dart alum. block is notched from the factory and it clears my 4" stroke, 6" rod combo (callies crank/rods) just to give you some idea of packaging. You will need a pan with notches too unless you want to get real creative. (pan spacer, etc.)
It does raise a lot of 'why' questions though on the 350 block-- there is a lot of HP to be gained by that extra 1/8" of bore, not just cubic inches, but in unshrouding the valves. One of the reasons why '358' cid busch/cup motors are big bore, short stroke.
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68 Camaro RS/SS, Katech tweaked LS7/t56 magnum
68 Camaro RS Convertible Project
2006 Corvette Z06
2011 Corvette grand sport convertible
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