Look man, I respect you and all, but a chimp could see that when you mill heads, the pushrods are effectively lengthened because the entire head assembly moves closer to the block. Unless he uses custom pushrods and adjustable valve gear, milling .100" off the heads will effect WHERE the rocker tips are in relation to the valve tip. I'm not gettin into a pissin match here, just statin the obvious. with .100" taken from the heads and stock pushrods and valve gear he could end up holdin the valves open on the base circle. I'm sorry, but I have top respectfully disagree here.
Maybe Comp Cams will help.
http://www.compcams.com/Pages/417/valve-train-geometry.aspx
Pushrod length DOES affect valvetrain geometry. Milling heads or blocks on an engine effectively CHANGES the pushrod length.
