Valve Spring Retainer ??

here is an old racers trick... valve lift + coil Bind + .050" = Installed height...

also what are your numbers you are getting?

think my erson spings were a 1.70 or so installed

If my memory is right,he had 1.60 and needed to be around 1.68. I know it doesn't sound like much but you're kinda limited where you can make up the difference ! As for the cam,I still haven't found what I'm looking for so I don't have that number to work with either !!Some day this chitt will come together,I hope !!