302 FACTORY ROCKER ARMS

[302V8]

I was  checking in my gm parts book about 302 factory rocker arms  part#3974290  it states that the rocker arms have a  "V" stamped at the end of rocker.      i recently saw some on ebay that sold  and they had a "O"  stamped at the end of the rocker.   does anyone know the diffrence?   thanks for any input.

[Jerry@CHP]

Originals have the "O".  Later replacements do not.  They are also very strong.  What we use in Stock Eliminator.

Jerry