Just an update. The 181 is still listed on the GM industrial engine website (http://www.gm.com/automotive/gmpowertrain/engines/specialized/industrial/2007_3000_industrial_all_comb_1_versOrig.pdf) as the Vortec 3000.
It's called marine and industrial only, but it still has the small-block (not SAE)bolt pattern. So if I get rich, I'll be able to buy a new engine.
