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Old 06-28-2006, 01:29 PM
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SCOBRAC SCOBRAC is offline
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Join Date: Jan 2002
Location: Northern California, CA
Cobra Make, Engine: -Sold- Contemporary 427S/C # CCX-3152 1966 427 Med Rise Side Oiler, 8v 3.54:1 Salisbury IRS, Koni's.. (Now I'm riding Harleys)
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well 5 parts 91 octane and 5 parts 100 octane yield a fuel of 95.5 octane. Remeber your 427 needed 96-98 octane back in the day.

Octane doesn't improve performance. It doesn't make your car more powerful or rev higher, faster or longer. Those are functions of cam and ignition timing. It doesn't boost cylinder pressure or compression, but it allows you to run more compression and higher cylnder pressures. Octane will let your engine live longer and not rattle apart, detonate or preignite and may allow you to make changes which will allow for performance increases
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