That'* true, carbon doesn't 'hold the engine together' at all. The only thing that could hold the engine together is perhaps sludge build up over an oil leak, and the seafoam in the oil will get rid of the sludge and make the hole very obvious. However, that is highly unlikely.
And I was talking about the vacuum line idea in my previous post. The way I did it, was 1 bottle vacuum, half oil, half gas. Worked great for me. Car smoked for a few days at WOT [I had 1/4 tank and half bottle seafoam].. but all was good otherwise. When I did the vacuum line one though that was a LOT of smoke.. so do it at night, otherwise you may have some complaining neighbors.. and when you drive the car afterwards.. I suggest also doing it at night on roads where nobody travels.
'89 SSE - GX3 -190k, 155k on body - Back for another ride.