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702ci V12 – 1960’s GMC monster

The 60’s and 70’s were an amazing time for cars.

“The block is one-piece with oversized bore spacing for improved cooling, and it’s equipped with seven main bearings,” says Ron Quarnstrom, who is forming a strategy to dyno test this engine at his R&R Performance shop in Minnesota. “It also has a one-piece, hardened forged-steel crankshaft that weighs 180 pounds.”

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