Our 1993 Bonneville was purchased new by my wife'* grandmother, driven for five years by my wife'* mother after grandma passed away, and has been in our hands for the past 10 years. A Bonneville of this vintage is not a collectable, for sure, but ... there'* some sentimental value, the body & interior are still decent, and we need it for a fourth generation of drivers.

Having said that ... a couple of rod bearings spun after 20 years & I tore the engine down. The cylinder bores look almost new and the cam is in good shape. The crank has light scoring & has been polished to improve its condition. I'm going to put it back together with new bearings & rings & try to get a few more years out of it.

My questions revolve around GM'* threadlocks, sealers, and lubricants "or equivalent" as specified in the factory service manual.

After reading other threads here, do I have this right:
Threadlock GM p/n 12345493 = Loctite Red 272?
Rear Main Cap Sealer GM p/n 1052942 = Loctite Instant Gasket Eliminator 518?
Intake Manifold Gasket sealer GM p/n 1052942= Loctite Instant Gasket Eliminator 518?
Cylinder Head Bolt Threadlock GM p/n 12345382 = Loctite Blue 242?

What are the market equivalents for ...
Jacket Plug Sealer GM p/n 1050026?
Cam Lube/Valve Lifter pre-lube GM p/n 1052365?
Thrust Bearing lube GM p/n 1050169?
Cylinder Head & Front Cover Bolt sealant GM p/n 1052080?

threadlock is good for locktite. for sealant, and gaskets i just use permatex ultra black. for thread sealer permatex thread seal. for the cam and lifters likely be fine to use some oil. sounds like you are reusing them.

Yes, reusing the cam & lifters. The lobes showed minor wear but look pretty good. The lifters seem fine after a thorough cleaning.