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Once something of a rarity, Dart's Big M blocks are now commonly used as the basis for big-inch big-block builds. The scalloped water jackets, priority main oiling, and overall beefy construction are all advantages. Standard-deck, 4.500-inch-bore versions start as low as $2,200.
Chevy Big-Block Engine - Big Time Power

Once something of a rarity, Dart's Big M blocks are now commonly used as the basis for big-inch big-block builds. The scalloped water jackets, priority main oiling, and overall beefy construction are all advantages. Standard-deck, 4.500-inch-bore versions start as low as $2,200.  View Related Article

 

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