well normally I run around *36 advance but it made a noticeable difference in power on the dyno at 40, forgot to mention that, but the guy running the dyno said that makes some sense because we aren't allowd to have an alternator and have to run a stock ish HEI ignition and they don't make much spark at 12 volts?? Maby I just need to back down the timing cuz the dyno and the track are two different things