[surfamtn]

Thanks Timmy, I'll keep your offer in mind.

In the mean time, I pulled the motor last week and today got around to taking the heads off, valley cover, and generally started cleaning the gunk off the top half.
I got my first look at the bottom half after I removed the oil pan....low and behold...

The number #4 piston rod was loose!

I removed the nuts that hold the rod on to the crank shaft (what's the term for that?) they sure seemed torqued down tight, and found the bearing/bushing was loose and pretty worn looking. I suspect his was the cause of the noise?!?

So, now... how do I go about replacing this worn bushing/bearing? I would like to just replace the one that is shot, am I foolish in not doing them all?
How do I go about sizing a replacement with out pulling the crank shaft and taking to to a machinist? Fwiw the crankshaft looks and feels fine in this spot.

As a reminder this is the first motor I've ever pulled and the first crankshaft I've ever laid eyes on. Lol