https://spokane.craigslist.org/pts/d/moses-lake-buick-455-stage-1-engine-and/7182556719.html Buick 455 stage 1 engine and turbo 400 - $700 (Moses Lake) image 6 of 6 © craigslist - Map data © OpenStreetMap I have a 1974 Buick 455 stage 1 GS out of a Buick Riviera. I never tried starting it. It comes complete carb to pan. It does turn over freely. (Air cleaner not included)
How does one tell if it's a stage 1? Block and head numbers are the same as normal 455 castings so I guess by the valve size?
Fist of all, the Stage 1 engine option in the Rivieras was not the same as the Stage 1 engine option in the (A-body) GSs. Both used the big valve heads, but the other parts were all different: camshaft, distributor, carburetor, etc. This Riviera's engine, based on the observations noted in this thread, could very be a replacement engine wearing the original air cleaner.
