I found a really good deal for a Cummins engine, complete, needs rebuilt, but because of the low price i am skeptical that the block and head are free of cracks, how can i test the block and head quick and on the fly before i buy it?

Hi All, I am considering buying a used diesel pick up in the next few months and I am in need of experience-based opinions and tips. While I normally tend to stick with Chevy/GM products, the diesels have put me in an interesting spot because it seems people are quite divided over the...