|I'm doing some work on an old Toyota 20R head (I'm restoring a '77 |Celica). | |I know you can't hot-tank an aluminum head, so does anyone know of a |good solvent for cleaning it all up, getting the carbon out of the |combustion chambers and ports, cleaning the valves without damaging |them, etc . . .
Purple cleaner - Castrol Super Clean - by the gallon is only about $6 - $7 and does a great job. Don't leave it on though as it will react with aluminum. Brush it on, scrub the nasty spots with more, then use a compressed air water siphon blowgun to knock off the solvent and dissolved grease.
Simple green works almost as well and probably does not react with aluminum.