I think Bondi did them for me for 160. So I've been checking over it this morning, the tic is still there but there isn't a loose pedestal bolt, all the rockers actuate meaning it shouldn't of dropped a cam lobe, there isn't any puddles under the pedestals indicating they're loose, the pushrods appear straight enough and spin freely when the piston is at tdc. The valve clearence is within about 1,2 thou for each other as I have them set at 12 thou.

I got a scare when I went to check no.4 valves, I stuck my magnetic stick in the combustion chamber and it went straight down!!! luckily I was on the wrong stroke so another couple of tuns and it was back to tdc. I'll double check valve clearance and adjust them but I don't think it'll make much difference.

Mabey it is something to do with the lifters, cam, rings, mains, water pump but it isn't as fast as the rpms it's as fast as the rockers and valves