1985 OMC is NOT a Buick, it's a 3.8L, 229 cubic inch Chevrolet V6.
The last Buick OMC put in a package was 1974.
p.m. me if you need a 3.8 short block engine cheap, JackandH20
Not trying to hijack this thread, but I thought of a question here. If you had a cracked block, would you have signs of water and/or oil in the bilge area?