Dart Big M Sportsman 10.200" Deck, 4.500" Bore PN 31223454
Dart engineered the Big M to be the strongest, most reliable, and easiest to build big block on the market. The Big M is fitted with Billet Steel 4-bolt main caps for ultimate bottom end strength. The Sportsman block is fitted with Ductile Iron 4-bolt main caps.

10.200" Deck
4.500" Bore
Ductile Iron Main Caps
Parts kit not included

Freight:

We ship blocks to all the lower 48 states.