I needed to push my valves partially out for some reason, and used a long-enough *fine-thread* 5/16" bolt through the guide and a variety of washers, sleeves and other implements of destruction, and drew them out carefully and controlled.
No banging, busting, or bashing involved and worked a treat (can't remember if I added some heat or not, but probably did)
Kinda did the opposite to put 'em back