Wally, I'm looking at the Clark Fork from the State park in Thompson Falls. The sun's just gone behind the mountain. It's hot and I've got no fishing gear 'cause we're returning from a funeral in SLC. Took the scenic route home right past your place I'll bet.
I took a 170 C.I. flathead Studebaker engine apart years ago for a ticking noise. Turned out to be a piston pin coming loose because the nut on the retainer pin worked loose. The pin was hitting the piston making the tic and the wrist pin had slid sideways and was about to begin wearing a groove in the cylinder wall. I drilled and lock-wired all the nuts. I've never had that happen on a Stovebolt but since you've got the pan off look carefully up in there.