Boring 454 Mag
#4
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Join Date: Jan 2007
Location: Murrayville Georgia
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some of the MK4 blocks are pretty done at .060 depending on the casting number and core shift. some are fine at .070 or so and the older 512 casting numbers are fine at .100 over if they dont have a core shift issue. seems like the later of the MK4 blocks were when they started getting thinner but not positive of that.
#6
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I ran a Gen V .070" over (4.320) for 13yrs up to 600HP at @ 6500 at a times with no issues. The engine was built at 420HP by someone else 6yrs prior to me. Not recommending it without the block being checked, but I have done it.
#7
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This motor would be around 800+ HP Just looking at an old project boat and adding the $$$ up. Ahhhh Toys!
#10
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