i drag race and i no if the timing doesnt advance you loose power on my truck i can retard or advance the timing to fit my needs if i want more power i ADVANCE IT for economy ill retard it not saying this is the case here but when i started swapping from glow to gas i wanted it for cost reason 17 bucks a gallon vs 3 bucks a gallon and 10 bucks for a glow plug to 2 bucks for spark plug the reason i stay clear from evolution gas motor is there plug is still pricey and i can almost buy 2 dle 20s for what one os 15 runs and im not knocking os ive ran there glow engines for years still running some now but i cant see a benefit for spending the extra cash