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Varies somewhat 120-130

We do most engines in the 9.5 to 10 - 1 compression ratio range.
There should be no problem with this at 93 octane or even a little lower.
At altitude, you should be able to go a little higher.
And especially if you have vacuum advance distributor, rather than vacuum retard distributors so common in the US.

John
V-performance.com






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