If my memory is half way correct, its been a long time since I have bought VP race gas, I think C10 ia 110 octane and C12 is 112 octane. Both have a different burn rate so they may be close to each other with the same jetting and timing, the final tuning on the dyno will tell you which is best for your motor thumbs IHTHs

Last edited by Cab_Burge; 02/06/16 05:25 AM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)