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Originally Posted by TJs98GT
a local tuner made me a low octane tune for my svt but i have yet to load it or try it since they recommend high octane fuel in it. but i figure with the adjustments to the tune it might be safe, never really wanted to try though since it would lose HP too
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Dood... the compression ratio on the SVT makes running anything less than 91 unsafe. Period. You can't detune compression ratio. It is what it is. If you wanna add a thicker head gasket, you can get away with a lower octane, but not through tuning.
DO NOT under any circumstances put less than 91 in an SVT.