Crankshaft harmonics?

[SSDiv6]

Originally Posted by art leong

I'm wondering if harmonics had a hand in my rocker to valve wear.
That is another thing that seems to be specific to my motor. Others have run same cams and springs trouble free.

Art, although you have a timing belt, the harmonics and frequencies will transmit to the valvetrain due to the lack of dampening from a crankshaft that lacks counterweights.
I believe that a crankshaft with counterweights and the right harmonic balancer will solve a lot of your problems.