I have a 96 roadmaster and it had water in the oil
Bad head gasket.
Cracked cylinder head, bad head gasket.
I HATE it when that happens-
Could be an intake manifold gasket. I am not sure if the GM LT1 is a wet manifold or not. I would look into that and "hope" that its an intake of a head gasket.
Looking for a Used Roadmaster in your area?
CarGurus has 75 nationwide Roadmaster listings and the tools to find you a great deal.
Search Buick Roadmaster Questions
Buick Roadmaster Experts