How to adjust adjustable rockers?

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This picture may help give you an idea on depth and width which judging by wear mark, stays in side of rocker arm.
96CFB5E4-F42D-43F7-82F2-A02A0EA49457.jpeg

I was going to do that myself, any idea how deep and long for the grooves?
Thanks
Steve
 
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take the plugs out of the ends and clean
shafts look like there are wearing well
How's the ID of the rockers look
 
If you're running a strong spring or a higher lift it might be a hood idea. Millions of 273's and 318's were built without the grooves. I think the 340's got them.
 
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