I have a 1968 336RC that doesn't hit the primer hard enough.
The new rear firing pin in the picture is hitting something, you can see the sharp line going across it. Lots of misfires. It feels smooth going up but has a sharp edge going down. What would it be hitting to cause this? I didn't have anything to loose, so I smoothed up everything on the original pin. The firing pin seems to move freely until the last fraction of an inch and has resistance.
These are the thing tried:
new coil spring and rear bolt spring and firing pin.
Cleaned inside of bolt with bore brush and turning a drill bit by hand to catch any hard stuff.
measured head space by measuring dead primer being pushed in
tried thickest rimmed cases when reloading. Factory loads misfire too.
Smoothed up front firing pin.
A one piece firing pin dealer said he couldn't guarantee his pins would work, and mentioned something is hanging up inside the bolt.
I may try some crud cutter spray in the forward part under pressure rather than just soaking.
But the fact remains that rear pin is hitting something it shouldn't.
Thanks.
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