The pushrod cup is wearing for some reason.  They're all rotating and I measured the lobe lift at .288 which is very close to the .295 that is stated on the cam card.  Figure in a little sine error and it's probably right on.  Does this indicate that the Y also has excellent geometry?  I've watched Don assemble several chrysler small blocks.  The geometry is so horrible that the actual lift that can be achieved tends to be around 95% of advertised.  It doesn't sound like much but thats about .030" on a .500" lift cam.  Of course, these measurements are at the valve.

I'm exhausted and haven't yet checked out the adjuster screw for burrs that may be doing this.  I'll just say that I'm a happy camper.  It'll be a cheap and easy fix.  To bad this kept the truck from making an appearance.

Lawrenceville, GA

Thanks Ted.  I have modified the rocker shaft.  All of the oiling holes in the rocker arms are obstruction free.  Have you had any of these rocker arms with bad screws?  The screw that corresponds with the bad pushrod is not breaking in like the others.  All of the other pushrods look ok.

The bad one:

The camera makes it look shinier than it is.  It hardly looks like it's been installed.  I didn't spot any wear pattern anywhere along the ball.

The rest have a similar polished pattern such as:

I'm also curious as to what formed the step in the pushrod in the first picture I posted.  I can't find anything to explain that.

Lawrenceville, GA

Wild guess as to why it is not shiny. Is the lifter rotating?