Quote Originally Posted by 417strokers
Some thing that no one has mentioned on a 1969 head you need to machine .230 '" from the top of the stud boss. Before you install the stud and guide plate or the bottom of the new rocker will hit the integral nut on the stud . one other thing It is better to use a Boss 302 -351-429 SCJ 7/16"stud than a chevy . The chevy stud is to short and don't have enough thread holding the rocker .


Machining 0.230" from the early-style heads will practically ruin them forever, and would certainly negate the longer studs you recommended. The Ford blueprint for machining down 0.230" off the stud bosses of 460 heads is for the late-style D3VE heads that have the pedestal-type rocker arms. You do NOT need to do this with the 1968-1969-1970 heads. We have built a lot of engines with C8VE, C9VE, & D0VE heads and never had to machine the stud bosses. Some people may cut them down 0.100" to compensate for the addition of the guideplates, but depending on components used and overall valve train setup this is not mandatory and can most often be avoided.

By the way, the BBC stud is 1.75"; as noted I posted in an earlier thread, use a 1.900" effective length rocker stud for the roller rocker valve train upgrade.

Paul