Cadillac: 86 Cadillac Motor Issues, cadillac sedan deville, head gaskets

Question
I'm considering buying an 86 Cadillac Sedan DeVille, with the HT4100 (4.1L) engine. I've heard from more then one source that these engines aren't very good. What are the most common problems that I should look for? I'm a sort of intermediate mechanic, I'm not perfect with cars yet, but I know where to find most things. Your help is appreciated!

Answer
The 4100 engine has problems everywhere from leaking head gaskets to leaking intake gasket to bad camshafts, Crankshafts to main and rod bearing problems.

Personally, I would PASS on purchasing this vehicle with this engine.