340, hydrolic lifter 273 rocker solid pushrod no oil hole

GTX JOHN said
When I ground down the 273 rockers for clearance (1.47 to 1.50 springs) on our
stock eliminator cars after perhaps 20 passes the would crack around the oil
hole and if not caught in time = actually separate from the shaft.
I did run 150 to 165 on the seats of the springs = You might have less issues
with stock spring pressure!
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Rocker would crack because of grinding stress risers, you have to grind the clearance correctly just as you would if you ground on the beams of your connecting rods, ALWAYS grind parallel to the beams of rods, rockers. Then polish the beams to get the grind marks out. Problem usually solved after that.