If you used factory valves in those 62 casting then chalk up the failure to them pure and simple !
Let me ask this where did the valve fail, at its stem to head transition, or up at the keeper end?
If it was at the head side then did you or whoever assembled the heads look very closely at them for nicks or deep enough scratches that could have been the source of the failure if it was not just pure fatigue in the the first place?
In short I would get the Ferrea 5000s and sleep well!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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