Ok i have a 305 tbi the octane i put in it is just regular like 89 or what ever so what would happen if i put like 104 octane? What would that do for like a 1/4 mile time?
thanks
kevin

 

higher octane is only meant for high compression/boosted application to prevent detonation, higher octane does not gain you any power, it has a higher tolerance to combust, that is all. you will make the most power by running the lowest octane possible without detonating.

by rule of thumb i have always did this.

8.5:1 and below = 87 octane
9.0:1 and below = 89 octane
above 9.0 = 91 octane

however this is not a definite answer and many other factors need to be taken in. it is only a guide. run the lowest octane possible without detonating and you are good.