I am a firm believer in the Smoth Brother's product! I had a rocker that wasn't oiling, and it ate the end of one of my Smith Bro's push rods. They were 5/16" diameter. I had a set comp 3/8" push rods the right length, so I put one in to replace the Smith Bro one that had the end eaten off. One run up to 6000rpm on the dyno, and the comp push rod just wrinkled.

-Kenny