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I put this on the engine site but no response. I have a 1970 396 that I have gone threw replaced the studs the same that were in it. The nuts are a 1/2 by 13 thread. I have been trying to find a two piece sure lock system that size, can not find. Any sugestions besides changing the studs?

Zak.:confused:
 

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Zak, I`m not sure really what you are asking please forgive me if I am just not getting it but why do you want lock nuts on your rocker arm studs, or do you mean lock nuts to prevent valve lash from changeing? If so have you looked for poly locks? If so one fix may be coupling nuts check this out from MSC supply Mfr #: 407-4032, you would need to take them to a machine shop and have one end turned down most likely, place a 1/2-13 set screw in the center and go.
 
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