So I finally dropped the oil pan to replace the gasket & see if I could find the knocking noise from the bottom end and I found the source of the noise...It is the end of the piston rod that attaches to the crankshaft. I can grab the rod cap and wiggle it side to side. I believe all but one of them will wiggle like that. Here is a video of what it looks like:
The quality of the video isn't that good, but what is happening is the rod is sliding left and right on the crankshaft journal maybe 1/16" but there doesn't appear to be any up and down movement or play from the rod on the crankshaft.
So how do I determine if I just put it back together or replace the rod bearings...or go ahead & start the dreaded rebuild? I've never used plastiguage since high school shop class & can't remember how to use it to check...Advice???