ok, so I'm having a brain fart and can't remember how to take the cams off so you can pull the head off.

Do you absolutely have to unbolt the cam gears?

The timing sprocket has to come off to take the head off. Does that allow enough play to take the cams off?
you can just zip tie the chain to the sprocket to keep it from falling, right? or am I thinking of the single cam?
Is that 19mm bolt holding the sprocket it just ridiculously tight, or am I missing something? I don't want to put the breaker bar to it since it is just bolted into aluminum, I don't want to run the risk of stripping it out. Been there, helicoiled that. It isn't reverse threaded or something dumb like that is it?

Sorry for the dumb post. It has been at least 2 years since I have had to pull a dual cam head off. Done a handful of single cam heads since then. I'm just having a "forgot how to use a wrench" kind of night.

thanks for the help.