CB350 K3: do I need to replace the base gasket now?

[Tugboat]

Had to remove the head last night on this CB350 to fix a stripped-out spark plug hole (not me!!). When I was wiggling the head to break it free from the jugs, I noticed that the cylinders were also pulling free at the bottom. I’m not planning on pulling the cylinders to avoid having to hone them and install new rings. By disturbing the base gasket, am I asking for leaks if I just button the whole thing back up? Or do I need to pull the cylinders now and replace that gasket?

 

[Sparbolt]

I would change the base gasket, and the O-rings at the base of the cylinder sleeves, as a matter of course. Less potential problems later. As for the cylinders and rings, no need for a hone, as long as all is well. Just make sure the ring gaps are all staggered properly.