Maximum compression on pump gas?

[X302LX90X]

I was thinking of building a high compression bottom end. I was thinking I could still be safe with 11.5:1 and still run 93 octane. If not I will have to change my combination.

 

[12Pack]

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I had 12:1 on my 87gt and it ran fine on 93. So i think your safe..

 

[5spd GT]

It depends largely on your camshaft and how it relates to the dynamic compression. Most will give you there static compression, but dynamic is the most important when it comes to compression and running 'pump gas'...

Dynamic compression in a nut shell is the compression once the intake valve closes...

 

[gcwh02]

12:1 on pump gas here

 

[86bluecobra]

yes I would think you should be safe with that compression.