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well. Our cars are pulling timing in a big way. Not sure how to explain it but with an eye on the AFR and an ear to engine, running without just to test how the car runs is a good idea. I already gave him precautions about what to expect when it comes to audible knock but we should not be getting this with the new motors and 93 octane fuel. A better test (now that I am thinking) would be to run close to empty on the tank of fuel you have and dump $50 worth of 103octane race fuel in it to see what happens.
Tom
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