Cesar, assuming you mean Hemi, a megablock means it is siamese bores. If it does not have core shift, it will go 4.500. A regular Hemi block is generally good for 4.310

[img]http://i.imgur.com/boeexFms.jpg[/img]
31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
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