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