Member Cannucky brought me his used heads from an engine builder.
The rocker shaft were worn, rockers also needed bushings.
His keepers didn't have gaps, something seemed funny as I tapped the retainers to release the keepers.
Long story short, the ridges of the keepers were near gone.
The valve grooves were also worn.
This engine was soooo close to dropping a valve, and he was a very spirited driver.
This was a short while after he walked into my shop and threw a Comp cam on the ground, - it had worn lobes .
I don't use Comp anymore, cuz of this and other sub-standard issues.
You need nothing but Good Luck if you use Comp . jmexperiece.