will any year 650 headgasket work on a cb 500 K1 running an overbore kit? I have installed the 605 kit from ebay, and I have been struggling with rebuild issues that have made it necessary to take the head off. I'd like to replace this one with one that will fit properly. will ID on a 650 gasket match or come close enough to those of the odd-size 605 gasket that I could interchange them? otherwise, the sellers of the overbore kit indicate that I would have to purchase a whole new overbore kit just to get a new head gasket.
suggestions are appreciated.
hym