im doing a complete rebuild, so ill be going slow and steady while im breaking her in, but once shes broke in ill be racing her often...so id like to get it correct....some other factors i have is that i put molybdendum oil soultion on the cam faces, so there is a film of oil on the surfaces when im checking the clearance....but ive slide the feeler gauge in so often now that i think most of it has worn away.....all of my valves are in spec but 3....or so i think.....i have 2 intake valves that the 0.20mm feeler (upper tolerance range, maximum loose) slides in with id say a medium resistance....and i have 1 exhaust valve that takes the 0.30mm (upper loose tolerance maximum) and it is much tighter a fit....i think im happy with this exhaust valve clearance because its such a tight fit....but id like the 2 intakes to be slightly tighter, they have a 154 shim a 156, this is the exact measurement of them, i used a mic...so i got a 158 and a 159 that im thinking about switching places with, this should tighten them up a bit.....the clearance on the valves that have the 158 and 159 were right in the mid range of the clearance range, at 0.15, so i think this would be ok? i guess what im worried about is the 2 intake valves perhaps having a clearance of say 0.21 or 0.22, maybe 0.23, the next size feeler i have is 0.24 and this one will not fit in....