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All model small-block Chevrolet V8 1955-66 California, 1955-68 with federal emissions. All non-emission trucks, and 1966-92 for off-highway applications. 9.5 - 10.75 - 1 compression ratio 3000 - 3400 cruise rpm. Basic rpm 2200 - 5700, 6500 rpm attainable with proper valve springs and lifters.
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