Engine charcoal and spark plug bonks

Dan, thanks for jogging my memory on how to do that. I knew there was ATF involved someway, but couldn't remember what, so now I know until I forget it again...lol. The old guy who I saw do that 40 years ago had a saying, "Kill the skeeter's first, then drown the carbon." When I saw him do it, the car smoked like a Tar Kiln while the ATF was being dripped in....lol.
The sharpest guy I worked for did that to maybe 2 or 3 slant 6s when I worked with him back in the mid 70's.