Decided to have a quick look at the engine
I removed 6 off the 8 exhaust studs, one has snapped off, another very tight. Oh well, best whip the head off then
Cam cover & carbs are off, once HT leads are removed, cam cover wriggles off towards rear of head.
Loosen cam journal bolts evenly, and centre roller guide. Remove roller guide (mine has mucho play!) and tie sumink to cam chain so it can't fall down tunnel. Now cam caps can be removed (numbered as machined precisiely to each position in head!) and camshafts.
Its important to work methodically and NOT mix up position of parts. Lables and/or photos help.
I've marked the shims & buckets for easier replacement, even tho I'll have to recheck & probably re-shim later.
Barrel look & feel really good. No scars, scratches or marks
I need to remove one stubborn exhaust stud & another on has snapped off flush

And on the 7th day... Zeds were created!