I have a 1992 Fleetwood 4.9L that needs a complete engine overhaul. Looking for a good machine shop that can rebuild the engine. Any suggestions? Even Cadillac doesn't have replacements according to local Caddy dealer.

The 4.1,4.5, and 4.9 Engines are very rebuildable. Cylinders or jug are easily removed and replaced, so over boring isn't necessary. Assembly is a little different because cylinder heads need to be installed, before the main bearing clearance can be checked. The block can distort slightly as head bolts tightened / torqued to spec. With the 4.9 there is one thing to keep in mind; 91-93 were built with short skirted piston which tended to be noisey on start up. They did come out with piston with a longer skirt to get rid of the noise, however power and economy sufferred. If you plan do your own rebuild, it is strongly suggested to get factory manual or atleast a reprint of the engine section of the manual for year of you're working on.