Proper dimensions? or = breakage?
Proper dimensions? or = breakage? 
Could this alignment have caused side loading of the rocker arm leading to failure? If so how do you correct for this considering even the head studs are not aligned with the valve stem?
TECH Veteran
Joined: Dec 2008
Posts: 4,147
Likes: 62
From: Little Rock, AR
The important thing to look at is the alignment and check the pattern when it is all put together. The measurements you have there don't really mean it will be out of alignment. The studs don't have to be aligned with the valve stems.
When moving the rocker arm laterally from side to side it seems like the roller tip was biased towards one side of the valve stem over the other. In fact the roller tip edge almost made it to the center of the valve stem when moving in the biased direction. In other words the roller tip isn't centered on the top of the valve stem. Does this mean I have incorrect alignment? Could adjustable guide plates rectify this problem?
TECH Veteran
Joined: Apr 2008
Posts: 4,985
Likes: 112
yes, ISKY makes a set which worked well for me to get 'allignment" correct. Mark the top of the valve with a marker pen, lash RR and rotate engine by hand twice. Remove RR and see where witness mark is. If dead nuts center than PR length is right. mark towards exhaust means PR to long, closer to intake means to short. A PR length check tool is $12 and handy.
yes, ISKY makes a set which worked well for me to get 'allignment" correct. Mark the top of the valve with a marker pen, lash RR and rotate engine by hand twice. Remove RR and see where witness mark is. If dead nuts center than PR length is right. mark towards exhaust means PR to long, closer to intake means to short. A PR length check tool is $12 and handy.
