Vintage Engines: Chevrolet's "W" Motor
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Because of the heritage between the 409 and the later engines, modern big-block Chevy crankshafts are the key to more displacement in W motors. At left is a stock 3.25-inch stroke 348 crank, next is a stock 3.5-inch 409 crank (a drop-in for 348 with the right pistons/rods), and a forged BBC crank on which Bruneau has re-machined the mains, snout, and rear thrust flange, and the counterweights are turned down to 409 size, which lightens the assembly but works only with the right pistons. (Photo courtesy of Bruneau Performance) View Related Article
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