Need serious engine help!!

[71SATELITE]

How did it happen... I am not sure but I need some serious advice. I have a slant that "had" a fresh rebuild on it. Upon pervios tear down wear looked normal. Well after this rebuild... I was towing down 95 with my slant and its fresh rebuild, maybe 200 miles on it. About 50 miles into it and I hear a terrible knocking sound. So I drive about 5 miles and park it, oil pressure was way, way low. Well upon tear down there just unbelievable amount of sludge in the engine (bottom end). So I pulled the mains, they looked decent but showed signs of a lot of dirt in the engine. Then I pulled the rods, man, not even in a magazine have I seen more devastated rod bearings. I figured on a spun bearing but none spun. They were just destroyed beyond all recognition. Some of them were even missing chunks!!!! The cam looked good, what the heck happened? Something went way wrong. Rod number 1,2, and 5 looked horrible, like solid copper with huge chunks missing. Crank is shot, can I use a standard crank in an auto? Thanks need advice!!

[sanborn]

If the crank was reground during the rebuild, it sounds like the oiling passages in the crank were not cleaned properly. During the grinding process as lot of grinding residue gets into the oiling passages. When initial startup occurs, this residue breaks loose and destroys the rod bearings.

[71SATELITE]

Nope it wasn't reground, it actully looked good. I checked all my clearances with plastigauge and everything was well within specs. I did have a huge problem getting this beast to kick over. I am sure I had a bunch of gas seap past the piston rings, my timing was way out, not to mention endless attempts to start. But I generously used assembly lube on everything. I did clean the crank passages and oil galley's with engine degreaser and a brush set I got from Napa that hit every crevice. Sanbron, would dirt in the crank hit the mains to? They looked decent, obviously they took somewhat of a beating when the other berrings went south!! Thanks for the reply.