I had problems with my locking nuts travelling too far down the stud which prevented the allen set screw having enough threads to lock down the adjustment nut. I bought thick grade 8 washers (.1 inch thick if I remember) to move the adjustment nut up the shaft a bit. I have not had any issues, although I have only broke in the engine and started it a dozen times or so since. I will be driving my car a week or so for a shakedown. Oh yeah, mine were 1.6 roller rockers on my EQ heads.
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