I just had my 799 heads milled .015" and I am running a .040" Cometic gasket from the stock .060" head gasket. My lifter preload was inbetween 1 1/2 and 1 3/4 turns. It started to open the valve when I locked them down. I don't do much stock stuff and usually only run 1/4 to 1/2 turn max on my normal builds with Comp 850-16's and Yella Terra rockers. I was just going to get some .035" shims tomorrow if it is a problem. What is the stock setting? I need help ASAP. Thanks in advance.