Rail Rockers on 289 Small Block Heads

[Shaggy]

Rec is correct for the most part except there were a few early early model 289 heads(carry overs from the 260) that were like chevys with press in studs and close tolerance pushrod holes to keep all aligned. Look at your heads and see if where the pushrod goes through is touching or is the slot is actually a round hole that would let the pusgrod flop around if the rockers weren't holding it tight.

What was the failure in you motor?

Also if you are doing a rebuild i would go to a new roller block and run a roller cam as well.