Originally Posted by Mr.Billy
1. IS there a problem with trying to clean the muck out of the ports on the head side? Like if some of this muck falls down while I am trying to scoop it? Will the valve train simply eat
The gunk is soft stuff, so unlikely would damage the cylinders, but I would not advise taking the chances. I did cleaning job on 603 engine head removed. The valves were closed, so I scraped the build up with side of screwdriver and than having air nozzle with long, curved tip I blow all the dirt out. It still left some gunk on the valve shaft, but per my observation the main problem is heavy build up on the cross-over pieces, while the head passages did not have that much. For intake and cross over piece I used pressure washer at 3000 psi.
Having the head on the engine you'd have to keep turning the engine to have the valve closed and do 1 at the time, but that should not take too long.