It will still work. I run a Cometic 85mm HG on my 84mm bore. It just lowers the compression a bit. One thing that does concern me is the .043 thickness. I know the OEM B18C1 HG is .030 so I'm not sure about the B16A; but if it is also .030 then that .043 is really going to lower your compression even further. :happysad: