In the late 70's, after graduating from high school, I worked some summers for a local paving company in Virginia. During this time, I sometimes drove a fuel truck that was on an F-600 chassis. They also had some light dump trucks on the F-600 chassis. IIRC, these were 5-speed with a 2-speed rear end. Normally we would start off in second. What engine would these trucks have had? Also, I sometimes drove a GMC oil truck, or "distributor" that sprayed oil on the road surface when we did surface treatment. This one carried approx. 2000 gallons of oil (that's what they called it, I think it was some sort of bituminous substance). IIRC it was a 4 speed/2 speed combination. This truck had a V-6 and was probably the slowest-accelerating vehicle I've ever driven. Any idea which V-6 it would have used?