Thread: 454 366 bbc
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Old 08-05-2011, 06:36 AM   #5
D13
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Join Date: Feb 2007
Location: Memphis MI
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Re: 454 366 bbc

366 is a tall deck, .40 higher on the block per side, allowing room for 1 extra piston ring. These were not used in 1 ton or smaller, strictly a big truck motor. 454 has balance weights on the flywheel and harmonic balancer. 366 crank is high quality and the same as 396/402/427, 454 is different. 366 has the smallest bores of the BBC's. If this is a big truck the 366 probably has cast iron headers. They tens to use 4bbl spreadbore Holley carbs, often with speed regulators.
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