47-55.1 What's going wrong inside my 350?

[NeoJuice]

Originally Posted by 1project2many

dsraven's suggestion to cut the oil filter open has merit. I haven't ever heard a noise that loud from oil flow through a bypass valve but I'll keep an open mind. Thinking back, that noise is vaguely familiar but I can't place it. I have heard a dry rear main seal make noise like that but IIRC that was a one piece rear main, not the two piece you're running now. I suppose a tight set of rings could make a noise and potentially so could a thrust bearing that is too tight fore and aft.

I'm waiting patiently to see how this turns out.

The truck engine is a 78 which should have a two piece rear main seal.