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Blykins,
If you want to run a cast crank, the key is to have a perfectly straight, true, set of journals in the block (read align bore and hone). If you do this, you will get the most out of a cast setup.
I'm no Ford guy, but I can tell you that if it were a BBC, I'd feel better if revs were limited to 6000 on a long-stroke, cast crank. 550 hp, no problem.
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E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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