Re: 478 to SM420
Go with the Chevy LS motor or stay stock 305. Balance the whole rotating assembly? Custom flywheel? Even the good old 454 will blow the doors off a 478 dump truck motor. You can't turn the beautiful GMC motors into anything but what they are. Nice, dependable, powerful, unique. new and used parts are not real easy/cheap to find, and get shipped to you, and get machined and so on.
Stay original or make life easy.
Last edited by AZKen; March 10th, 2017 at 02:58 AM.
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