Webb27 feb. 2011 · Re: LT1 10128374 Casting. Those heads flow 200/215 cfm peak at around .450 lift with the stock 1.940 valves. Using a 2.00 valve I have ported them to flow 295 cfm around .700-.750 lift. Chamber wise I think they were closer to 58-60cc chambers but my memory is fuzzy at the moment. WebbChevrolet Performance’s Fast-Burn 23-degree cylinder heads deliver maximum performance for Small-Block engines. An aluminum head casting – distinguished by Chevy Bowtie logos at each end – and a valvetrain with high-rpm, LS-style beehive-type valve springs stretches the performance range of the heads to enable greater power at a …
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