what gas

Have old 460 in my F100 (Holly 4 barrel) - what is the best octane to use?

What year is the engine and or the compression ratio?????

Gentleman told me motor came from a 75-76 f250. Stock motor. Do not know compression builder is in hospital and do not want to bother him yet.

That year of engine, if the heads haven't been milled or higher compression pistons installed, should run fine on regular gas. Also depends on what the timing is at, and whether it's just cruising, pulling a load, or a bit of racing. If it's just an occasional driver, I guess I would put premium in it. Just better gas, better performance, and less prone to detonation. Hard to say for sure without knowing more about the engine internals.

Quote:

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Originally posted by flames
- what is the best octane to use?

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Whatever doesn't ping. Anything more is a waste.

Thanks for your help.