New engine was steady at 7-8" of vacuum with UDSB 288/296-F5 solid cam. Then I change cold lash from .020 to .022, now engine runs rougher and vacuum gauge vibrates but smoothes out as RPM increases? I also changed the power valve from a 2.5 to a 4.5, any ideas what might be causing the vacuum gauge vibration? It could be related to this or something else like guides since the engine is new?

I'm gonna go check the lash hot and see where it's at.

Thanks!

Update, just found a rocker nut in the head graemlins/sad.gif

that will do it

The jam nut and set screw where both laying near the oil drain hole separately, someone must be looking out for me :eek: know wonder why people run those little screens, little life savers man! Good thing I didn't need them.........this time smile.gif

I'm missing one, and I tell ya, we both should be buying epoxy and screens.