Re: Proper gas for 374 engine

Posted by Jack Vines On 2011/2/21 18:32:22
Answer - the highest octane sold at the pump plus a can of octane booster.

Answer to the question you didn't ask - Have your distributor rebuilt and recurved to 374" specs. Over the years, I've seen many Packard V8s with distributors swapped around. There are two manufacturers, Autolite and Delco. There are four different centrifugal and vacuum advance curves. Get the right one for your engine.

jack vines

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