Thanks Radian. Now, I would like you to guess how the GM Top engine cleaner + oil method you used above can be adapted to on-engine cleaning, without the head removed. Please give it a try conceptually and lets see how that might look like. If you come up with something workable, then you've done us all (and yourself too) a big favour.
Secondly, would you say the GM's top engine cleaner is just the same as any other carburetor cleaner? Would you mind have a look at the lable and seeing if the same chemicals are used in both ? Thanks.