My apology in advance. I tried the search but no joy. I saw a vidio clip on this site where someone was cleaning the carbon build up using seafoam and can't remember the exact entry point and can't seem to find it again. It could be buried in a thread that desn't even come close to what I was trying to search, so does anyone have an idea or link to find it again?
TIA

 

https://www.northamericanmotoring.co...t-r55-r56.html

 

Thats it. Thanks