I'm building a 460 and need to know if I should use guide plates for the pushrods. I am planning on using a set of roller rockers. I'm using '68 heads off of a 429, so I already have studs for the roller rockers. I was just curious because I have never dealt with guide plates and need to know whether to use them or not. I heard somewhere that you have to mill down the boss that the studs screw into the thickness of the plates. Do you still have to do this if you are going to use adjustable roller rockers? Thanks for the input.

 

If you want to use stud mounted rollers you will need guide plates that are held in place by the screw in studs. So yes you will need studs and guide plates. I don't know if you have to mill any thing down on a head with pressed in studs, but at the very least you will have to drill and thread the holes. The guide plate is the only thing that stops the rocker arm from spinning on the stud so if you don't have the guide plates you rocker will just slip right off the valve.
-Johnboy

 

those heads have the screw in studs, but rail cast in the rocker arm for alignment.
you will have to mill them, add guide plates and new studs for the roller rockers
the old studs cannot be used they don't have enough threads

 

Brownfoot, when you say I am going to have to mill them, do you mean the heads themselves?

 

if I remember correctly, the Crane kit has instructions for milling the boss for the rocker arm stud (mill depth is the same as the thickness of the guide plate), guide plates, new studs, and rocker arms.