It's not the only way to do it but quench flat out works on a street engine real well by allowing you to run higher compression and pump gas. My 408 iron headed (EQ's) is 10.03 to 1 and has no problem running on 92 octane. Correct me if I'm wrong but I'm guessing that in your race car you had a bunch of compression and probably ran race gas thus quench wasn't a big deal with your combo