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Old 08-28-2013, 04:52 PM
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Join Date: Jul 2009
Location: Westerly, RI
Cobra Make, Engine: Fordstroker 408w custom solid roller-Craft ported Brodix 17*heads-CFM ported Vic Jr. intake-1 3/4 primaries- 575hp-TKO-600RR Liberty upgrade- -Moser 8.8 trutrac-McLeod Street Extreme--QA-1-Wilwood brakes, Classic Chambered 3" Cobrapacks, Avon's
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There is no magic number for you to determine whether you need more octane. Chas is correct with 11:1 being the static # most use.
Head design has alot to do with it as well as cam timing.
I will say this; If you are on the edge DO Not Trust Pump Gas quality, tests have shown this. I would run a mix of race gas for insurance if needed. I do. 10:75:1 SCR and 8.2 DCR
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