350 sbc 40 bored over many performance parts
intake, headers, cam, ect.
turbo 350 tranny with shift kit and 2500 stall 4:10 posi rearend
TIRES size i don't wan't to run slicks forever and im sure i can't what size do you guys think, i will be getting them soon and plan on putting on all four same size tires i was thinking 255 60 15
Any suggestions or ideas about what woule be practical

 

Is the car cruising in an acceptable rpm range with the tire size currently on it? If so, replace them with a tire having the same size as the current ones. As long as you keep the overall diameter close you shouldn't see any difference in the way the car runs, but remember changing tire size will move the cruise rpm of the engine up or down the power band. Tire size can add performance or take it away depending on which direction you move away from the baseline. You should play around with a few different tire sizes and see where it puts your rpm and speed. Then decide what size to go with. This calculator will help out greatly so you don't have to do all the cipherin' by hand.

Speed versus RPM calculator

 

ok Thanks alot mike!

 

what's the technical reason lots of people have smaller tires up front for example 225 50 15 and bigger ones on the rear 275 50 15. is there a rule or something or will i be losing or hurting anything by going with all four same size for instance 275 50 15 all around or 275 60 15