Aluminum cylinder heads

fishmens67 said
I had to do that with my first set.
Geometry correction solves that problem
Most rocker arm failures are do to improper geometry.

SuperStock426 said
Pushrods were measured precisely. The problem was in the rocker arm itself. I've installed about every rocker arm assembly made and never had the problems like with these. Install height was checked. Everything was checked but still the rocker arm hit the retainer.

This is your answer regarding geometry being mentioned.

B3RE said
Can you elaborate on precisely measuring the pushrod for geometry purposes.

SuperStock426 said
An adjustable pushrod tool and calipers.Rockers were spaced and centered on the tip of the pushrods. When everything was adjusted had two threads showing at the bottom of the adjuster protruding from the bottom of the rockers. Order my pushrods through Smith Brothers. Measured install height as well..Used Isky springs.

This is how you answered my question about pushrod length concerning geometry.

yellow rose said
Pushrod length does not affect geometry on shaft mounted rockers.

SuperStock426 said
I don't remember saying anything about measuring the pushrods for geometry. I was stating how I measured the pushrods and what I used along with how I set up the rockers and checked the valve spring set up.

Yep, you did.