Sorry, I misunderstood. The rule of thumb is to dry clean and scrape carbon for the piston tops. You don't want any liquid that may dissolve carbon and let it get on your compression rings and cylinder walls. If you have--try and clean the cylinders with a clean soft cloth.
Cleaning heads you can use anything that works as long as it is clean when you are ready to assemble the engine. In machine shops they remove the valves and vat boil the head.
If the head is aluminum, be very careful not to scratch the machined surface or use sand paper as you might damage the block contact surface.
Are you doing a valve job or just replacing a head gasket? Good luck
Friday, May 12th, 2006 AT 5:03 PM