Drive Like You Stole it... I did and I will....

Thought I read every thing on the magnum heads.
Heads coming off to clearance push rod holes and then going right back on.
Read this right now on Hughes tech site:
Now, to those of you planning on using a flat tappet cam, either hydraulic or solid and stock or roller rockers, there will be an interference problem between the push rod and tunnel or opening in the head for the pushrod. This is due to the fact that the Magnum heads.

Were originally designed for a tall hydraulic lifter. When you use a shorter flat tappet lifter the angle at which the pushrod goes thru the head changes. We mill this area out on a vertical mill. We are working on a drill fixture so you can again do it at home with a drill.



This is where the pushrod hits the heads when using flat tappet cams.