Unless you're running a fairly high static compression ratio, you won't gain anything by running high octane.

High octane is all about slowing down the burn rate which helps to prevent detonation.

If your engine will run on 87 octane - and it might, skip the high price stuff.


The 462" Buick engine in my 32 is 9.0/1 compression ratio and I run 87 octane in it year round with no probs.
Not even in the summer heat waves here in the Dez.
104 degrees F today.


There are a few things you can do if you have an overly high compression ratio and none of them require the crank & pistons to be removed.