A sad story has led to the purchase of a pretty nice tool. A Wireless Endoscope, specifically a Papake WiFi Inspection Camera with Light 2 Megapixels 1200P HD from Amazon for about $25 bucks.
The sad story part is all on me. I put a lit'l 302 together a few years ago for a little 4 cyl car that I'm leery of mentioning the name of.
Well, it developed a noise I really couldn't diagnose and I wanted to make several changes so I dropped the subfame with engine/tranny as a unit with the wife's help. After removing 8 bolts and and disconnecting all wiring and hoses the wife ran the 2 post lift while I kept an eye out for problems. Once the body cleared, we rolled the subframe with everything in place out of the way, raised the lift way up, and parked the Duster under it.
The above was two years ago and everything is still up in the air, so to speak.
Back in the summer that project worked it way to the top of the list and I pulled plugs, oil pan and valve cover. Checked main and rod bearings and wrist pins, found no problem. So buttoned it back up. Move on to other work.
Then a few weeks ago it was back on top of the list, roll the engine (on a stand) out, remove the cover and NO sparks plugs. I forgot to install them several months ago.
Dirt daubers or mud wasps are BAD here. I know every cylinder has to have mud nest. Don't want to pull the heads just for a look so I bought this.
It works Great. Checked the cylinders and found one small mud nest I think I can get out by breaking it up and vacuuming it out.
I highly recommend one of these little wi-fi scopes. For $20 to $40 bucks they can pay for themselves pretty fast.
Images below show the tool and what I found.