Why are you being told to scrap the engine? Spun camshaft bearings are not common, but you replace the defective parts. In this case you would replace all the cam bearings, the camshaft, and the lifters because they wear to match the wear on the cam lobes. Push rods are reused. Since you're in there, examine the crankshaft and connecting rod bearings but keep in mind that in most engines, for oil to leak out easily past a spun cam bearing, it had to go through the main bearings to get there, so even though the oil pressure was low, those bearings were not starving for oil and will likely be okay yet.

I DO read quite a bit here about low oil pressure problems on a lot of different engines, but if there were some common problem with yours due to the design, why would you want to install another one like it? My vote is to fix what you have. Even if you do replace the whole engine for a relatively minor repair, there's no reason it can't be used for a core unless there's something broken or damaged beyond repair that we don't know about.

Answered by caradiodoc (expert)
17,655 answers provided