Optimal Valve Lash

I've been in this same battle with that loose lash for years. It's 28/32 hot, I set my iron block/aluminum heads at 23/27 and it's right on spec when hot. 28/32 sounds really loose, but I've been running that for 8 years. Tighter gained me nothing. Cam design is such a voodoo art I've learned to just roll with what they recommend. It's definitely and old fashioned cam design, but it works pretty good.