:dunno just had my BS changed and timing belt replaced. Now I seeing an engine that start easier. But it seem to stumble a little more (lap) then before the belt was changed. It does it while going and before it only seemed to do it from a start. The bolts on the cam are centered in the slot, so I'm thinking the timing is a little off. I read that it can be between -2.5 to 2.5 with 0 optimum. What is the best setting I should be shooting for? What does -2.5 mean (BTC or ATC)? What happens as you go positive or negative from 0? Mileage seem to be a little less but so small that I'm not positive on that one.:dunno