.080 but with my setup, the valve length wasn't even a concern as I had plenty of room. Again, these are Thitek heads and my springs are dual PSI 1513s. I had plenty of clearance between the retainer and rocker during the full range of motion. As I also mentioned previously, I shimmed the rockers to center them on the lash caps. Since I was not able to find shims for the rocker shafts, I went back to the old rocker shaft shims for the small block Mopars. They were very close, and with a little modification fit the Thitek heads.