The 557 blocks are good for about 400+HP with the stock stroke crank. They aren't good for strokers, because of the extra loading on the main webs with the larger stroke. No NOS or forced induction either. Truck duty should be fine.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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