Ok, so my truck is due for a smog check in the next month. 94 350tbi, shouldn't really have trouble passing, cept the timing isn't set at 0, its retarded a few degress. Last time i had it smogged, they wouldn't test it with teh timing set like it was, so they set it to zero and checked it. Then the motor started pinging on 87 octane, so i had to have someone else set it back again. I know nothing about timing, but want to check my timing, set it to zero for the smog test, and then set it back. How do you do this? What equipment do i need? Timing light im guessing? Thanks guys!