[Batman]

"In theory" they should stay put in the retainers if you just turn the cam a few times witht he rockers off and the pushrods out, when I had my first cam put in at Rapid that is how Mikey did it. Gutsy. I've seen the pen magnets done and also I have seen them fall into the engine (fortunately they were recovered). Go with the dowels, just be careful when you put them in and take them out that you don't damage anything.