No production ZL-1 engine got anywhere near 625 hp.
Can't blame the dealer as that is the number Hot Rod put on the cover of the December 1968 issue, with an in-depth feature on the new engine. The article includes the statement “And no, Chevrolet wouldn’t permit us to divulge exact power levels.”
A Chevrolet Engineer interviewed for a 2011 Automobile Quarterly ZL-1 feature stated, "Every one that went out of here was between 500 and 535 horsepower on the dyno, running Sunoco 260."
Bill Porterfield and Camaro Hi-Performance have each done restoration ZL-1 rebuilds with essentially the same dyno results.
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11-16-2025, 05:33 PM
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