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Originally Posted by joe_padavano
........ With the 3" mains in a DX block, you can ........
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Were we discussing D/DX blocks?
D block (.842") would be preferable to DX (.921") unless one had a compelling reason to use expensive lifters, or bushed lifter bores.
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........ drop in a forged 425 crank ........
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It does not, just "drop in".
Counterweights must be cut for clearance and the missing weight replaced with significant amounts of "Mallory" AKA "heavy metal" (tungsten) in order to maintain its balance.
If one chose to use that crank in a "gas" block, the mains would be reduced to 2.5", in addition to the above.
Either way, an easy task for any "competent" machine shop.
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........ I'm not sure you can use the full stroke in a DX block ........
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4" is not a problem.
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........ you can build a 420-ish cu in small block that's nearly indestructible.
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Several 454 (4.25" X 4") and 440 (4.185" X 4") have been done that I know about.
Joe Mondello sold kits, for both, before left the LA area.
Back on topic:
Sonic check of the block. If it will go to 4.185, the crank can be offset .05", to get 382.96.
60 over 400 Chev pistons (pin height to chosen later) and 6" Chev rods.
Mill only the minimum required to square the deck of the block.
Actual deck height of that block, combustion chamber volume, and the engines intended use, would determine the desired compression height of the piston.
Only an example, of how it might be done.
Norm