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I am getting some detonation on occasion on low RPM under load on acceleration. Just began occurring in a couple of my cars at the same time. Maybe could be crapy gas as I got the gas from the same station (says 91 octaine on the pump, but some how I doubt it). Is 91 the highest octaine that the common gas station has here in Southern CA? If that is the highest, anyone know of a good source of racing gas in Orange County CA?
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Try "76 UNION" Stations. The one up here in Manteca, Calif. sells the 103 octane racing Gas. The last time I looked (months ago) it was something like $4.50/GAL. If you need to know exactly what the price is, let me know and I will "Swing by" and see what the latest price is for the stuff. Be advised that it is for "off road use only" and that running it on the "street" will have you subject to a fine. But that never stopped us before, has it!! Regards, Marlin.
In researching for an article in the POCA news a few months ago, I noted that there are fifty-five (55) different 'race gasolines' now marketed. Among other things, some have significant amounts of tetraethyllead in them, subjecting the supplier AND user to a $10K fine for any public road use. All these also have slight changes in viscosity & density which means that you will have jetting problems if your engine is tuned for one type and you then change to a second one. I would suggest you mechanically fix your engine rather than getting "hooked" on the race-gas thing. A valve job followed by thicker composite head gaskets and some attention to the ignition timing should allow 91-octane to work just fine. I built & ran my current engine to 10-1/2:1 compression with aftermarket cam etc and it not only thrived on 89-91 octane, it passed CA smog testing (until that became unnecessary)
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