<------ My 2 cents. I have O2 sensors in each collector. They do not play well with leaded fuel. I run 93 octane Sunoco with the Race Gas (unleaded freindly) additive. 5 ounces race gas per gallon , gives me 103 octane, have also run it 105 octane but made no difference. Runs fine, 37 degrees advance. I have 11.4 comp, big roller cam, alum. heads. It works very well but it does discolor the plugs, but that's what the O2 sensors are for. The can size I get is 32 oz. so I can treat 6 gallons. The can costs $29.97 at Summit. Is 100ll lead free?
