What fuel was used when it was tuned?
Can A Higher Grade E85 Cause A Stumble?
Proform 850 carb on a 406 SBC. Ran great, instant response. Had dirty fuel put in the car and we dropped the tank, cleaned it thoroughly, ran new gas line, new filter and removed bowls/metering blocks and cleaned. Repeated the carb cleaning again with new accelerator pumps. Car has a slight stumble when punching it off the line. At this time we went with that high octane E85 that is $9.50 per gallon. One person said upgrading to that higher grade of fuel may lead to a complete retune. That possible?? Maybe still minute dirt somewhere but we don't see that is possible?
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E85 not this top of the line high octane 85 now in the car.
what did the "pump" E85 measure at when tuned?
What is "high octane" e85?
Found the problem. Vacuum cap had a big crack.
it is only for use in motors that run 3/4 race cams.What is "high octane" e85?
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