Why do I keep breaking rocker arms?

GTX JOHN said

Are your Valve springs in Coil bind?
They should have at the very least
.050 clearance.
If they are going solid that would break
rockers.

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Exactly! And on a slant 6, the rocker would likely break BEFORE the pushrod would bend, because there is no exaggerated pushrod angle as on a small block. I think you may have nailed it.