FFJ,
Just wandered onto your thread and didn't read all the way through it, so please excuse if this is NOT helpful. BUT, I saw you're building a big bore and there seems to be some issues and things you still need to buy. I came across this ad from my local CL that has some of the same things you mentioned - here's the gist of it. Might be worth looking at?? He was asking $700. I can send you the link, or if you go to Mpls CL and search 'action honda' or similar, it will pop up. Good luck regardless!
Cheers,
G
'Action Fours' Stage 2 Street/Strip 12.5-1 compression 590cc Big Bore Kit out of a '75 CB550 Super Sport up for sale. The kit was removed from an engine with 7000 documented miles, complete with original receipts for the installation/machine work from back in '77 at McNamera Cycle Sales in Saint Paul, MN. The kit is complete and includes re-sleeved and freshly honed 61mm cylinders, 12.5:1 polished and relief-cut ART domed pistons with wrist pins, rings (one piece oil control), Stage 2 K&H cam, Titanium valve retainers/keepers and racing valve springs, all loaded in the head, (which is included in the sale, along with the required post '76 pinned rocker arm cam cover) ***There was absolutely nothing wrong with the engine at the time of dis-assembly. All numbers mic'd to the high end of spec, IE: No Measurable Wear. It had 170-plus psi across the board, with less than 5% leak-down on each hole, done with a 100psi test*** This top end kit is a straight forward 'plug-and-play' swap, just supply the top end gasket set and you're good to go.