[C10 - C90 Bill]

Also, let us know what kind of Exhaust you are running. I'm going to say that the truck has Duals, but let us know if it doesn't. Also important are Mufflers. Make sure to run Straight-Thru ones. Or as hi-performance as you can stand the sound. Part of the great mileage on my 292 was that I would run the shorter and smaller Straight-Thru GMC V-6 Mufflers, which seem to be no longer available. I have since switched to Cherry Bombs. Sounds great too, lol.