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Made it about 34 miles in the Silver state when "BRAP BRAP BRAP BRAP...." happened at 4700 rpm doing about 137.

It sounded like I pospped a spark plug, but it was too loudm it was still firing. It later guessed a broken valve spring on an intake, allowing the valve to drop, hit the piston and get jammed up in the guide, allowing the combustion to backfire through the manifold. Wrong. It is time to retire the Crane Golds. The adjuster was there and set correctly, but was loose.

I run about .640 lift and 400 - 430# open spring pressure on these 1.6's



Sorry about your troubles.

1.5s will last much longer, be much more stable and oil better, less chance of burning up the adjuster. Don't blame the rockers. Blame the adjusters and the ratio,imo.



I don't know, I don't trust unbushed alum rockers on steel.

What are those rockers rated for for open spring pressure ?

OP are your shafts banana groove ? If it was getting hot enough to burn up the oil it was on it's way to siezing on the shaft , I bet it's not the only one you will find with some damage. How close is that one to the oil hole that feeds the shaft?