Well, I found out today that my 1991 V3500 Crew Cab 4X4 has a piece of crap 305 Cu. inch engine in it that was probably salvaged out of a junkyard (brackets, manifolds, and all). It originally came with a medium duty 4-bolt main 350 engine. I suspected for some time that the engine it was not the original. It ran too good to have 120,000 miles on it. I am the third owner of this truck, and I am pretty sure the people I bought from where not aware that it did not have the original engine in it. Oh well, all I do is drive it around town, and the 305 will have to do until I have fixed all the other stuff it needs. It is a lot of work for a 305 to pull a nearly 8,000 pound truck around.