The 461, 462 and 290 casting 'double hump' heads have 62-64cc chambers. Those along with that small cam, I doubt you could run straight 91/92 pump gas.
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Originally Posted by Chevy Fleetside
Not sure about the CC's on the heads. I know they are 2.02 intake Double hump heads. The cam has a 454 lift and If I remember right a 268 Duration.
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