by Petesnova on May 16th, 2007

Petesnova

Question

Help answer this question below.

454 Chevrolet 7.4 liter engine from a 1976 Chevrolet pickup truck , what is the compression ratio ? Will this engine run on 87 octane fuel ? I just picked one up.

Answers. 2 helpful answers below.

  • by G-MAN on October 7th, 2008

    G-MAN

    8:1:1 87 octane unless the engine has been modified like bigger stroke

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  • by Darryl61 on May 16th, 2007

    Darryl61

    Yes, this engine will run fine on 87 octane regular unleaded. Please keep in mind that octane ratings listed for older engines were determined using the "research" octane number, then came the "method" octane rating, which was vastly different. Current octane ratings are an average of the 2, and aren't significantly lower than older numbers, just figured differently.

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