4.3L rocker arm adjusting nuts

[akriverrat]

1990 production 4.3L gm marinized by kodiak. center bolt valve covers. non- vortec. in 2001 exchanged heads for rebuilt. removed pushrods, rockers, rocker balls, and rocker adjusting nuts and re-used them on rebuilt heads. old heads and rebuilt heads both had 8mm screw in rocker studs. the 8mm rocker adjusting nuts are not self locking and would not hold adjustment for more than 1-2 minutes running time. i could not, cannot, locate any 8mm locking rocker arm nuts. my "temporary" solution 150+ hours ago was to squeeze them in my vise and oval the holes but would like to find a more permanent solution. anybody know a fix?

 

[horndog]

Re: 4.3L rocker arm adjusting nuts

home depot?

 

[snapperbait]

Re: 4.3L rocker arm adjusting nuts

GM Dealer would have or could order for you..<br /><br />Not sure here, but are you absolutely sure those are 8mm?.. My experience there are usually 3/8"-24 or maybe 7/16"-24 thread? I dunno?

 

[akriverrat]

Re: 4.3L rocker arm adjusting nuts

tried dealer and non-automotive sources local. another thing i would like to know is what kept them from moving the first ten years? and yes they are 8mm.