i was telling a buddy of mine about pinging issues today and about how it might be carbon deposits that are causing this in my cars case. he agreed that its possible and suggested that i try running a few gallons of race gas through my car and see if it makes a difference. he said that in some engines hes taken apart that the ones that ran on race gas didnt develop the deposits like the pump gas ones did. oh yeah.. leaded race gas.... he told me of a place that sells it around here but i forgot what kind he said to get. i think he said VS? it was some two letter combination like that. id like to do something like that as it seems the car will still ping even with mild timing setups. all i run is 91 Octane and i still cant get a decent timing curve out of the damn car. im willing to try this at the moment as i figure i wont hurt anything except my wallet for a lil bit. i dont plan to continually run it, just maybe a few gallons here and there every so often. plausible? any other way to remove teh deposits? i have an extra pair of heads around here that are kinda carbon filled so i do know at least that parts possible. i just want to know how to get rid of it without pulling anything apart. i see crap in the auto parts stores but i dont like alot of thsoe treatments as they never seemd towork for me. lil help?