Steam will take that carbon RIGHT off. DAMHIK. <img src="/forums/images/graemlins/drunk.gif" alt="" />

One of the tests for a leaking HG is scoping the cylinder and looking for a clean piston crown. Yes, carbon is hard to scrape off, but with heat, compression and temperature it is an entirely different ball game. I see no reason to think Seafoam wouldn't do at least as well as steam.

-Bill
'87 4Runner w/ '96 5VZ-FE, 'Red Chili II'
'97 Taco XtraCab 3RZ-FE, 'BlackBean'
TLCA # 13257, Rising Sun 4x4 Club Land Use Coordinator
"He who stops being better stops being good." -Oliver Cromwell