Which Octane Gas For 502

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08-30-2009, 05:08 AM

riverone

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Which Octane Gas For 502

Just bought a boat that has a crate 502 with a 4 barrrel carb. What octane of gas should I be burning?

08-30-2009, 08:14 AM

ThirdBird

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Unless your 502 is built up beyond stock, 87 is all you need.

08-30-2009, 10:17 AM

Audiofn

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Yup 87 is all you need. I ussually try and run 89 or 91 in mine just because the gas sits in the tank some times for a while and I want to make sure that the octane does not drop with the Ethenole. Not sure if this is sound thinking or not but figure it can not hurt?

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