diesel swap

[406 Q-ship]

The 6.2/6.5 would be the best and easiest sway into the van, cause GM did the work for you. Use the 6.5 over the 6.2, the 6.5 runs like a 350 where the 6.2 runs with a 305. When I was working at the dealership in the 1990's the 6.5 would roast the tires in a G3500 van, the 6.2 would not turn a tire on anti-freezed polished concrete. We had a customer who had an early 80's G25 van that was the old style 6.2 that was just really tired, we had a 6.5 that was a warrenty takeout for head gaskets/head bolts. We changed out the gaskets and head bolts, installed that bad boy in the van, holy crap what a difference!