came across this guy, has done / is doing amazing rebuilts from plain scrap, have a look if you have some free time (I put these videos in X2 speed, works fine
I would like the releasing spray that he uses, assuming that it is all genuine. Bare hands in the cleaning fluid makes me cringe as washing up liquid causes problems with my skin.
saw a couple of more videos, some bits are slightly staged for the video, but looks like he genuinely rebuilds motors with minimal renewal of bits (even reused the headgasket on the 4pot diesel
Seems to be slightly lucky as both engines I've seen where clean inside no seawater in the pots which I find a bit suspicious. OTOH, it would be massive amount of time to stage cleaning a scrap engine and then putting together another one that was also rebuilt but not wasted by salt water. dunno!