I have developed a process to correct the issue with GM Z bars that eliminates the lower pushrod hole from becoming egg shaped thru wear.

I reinforce the area, and then machine it to accept a replaceable oillite bearing.

The bearing accepts the standard GM pushrod.

My car has had this for the past 3 years, and it works flawlessly.

I charge $75 for this service.

Additional charges:

Beadblast/etch prime/paint - Add $25

2 week turnaround time.

 

can you post a pic of the bearing you use.