Last year I changed the right side head gasket. When I pulled the head I
was amazed at the amount of carbon and such that had built up. When I got
things togeather I started to use "Chevron Fuel System Cleaner with
Techrolene". I figure maby 4-5 bottles of the stuff went in the tank since
then.
   About an hour ago I finished pulling the left head and was again amazed
but this time at the amount of carbon and such that was NOT there!!! While
it may be that one of the real mechs here on the list can come up with other
explainations to account for this, off hand I would say that this stuff
WORKS!!!!!