Rockers for a 3.2
 

I’ve sorted through a pile of rockers and have found early and late style and most with a triangle sone with a B. My stock rockers are B. The new replacements, 2, are both wearing unevenly and will be machined or replaced with “B” if that makes sense. I have plenty to choose from. Is the delta version aftermarket?
Will install 964 cams, otherwise stock.
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I believe the delta was factory, I have them in my Carrera engines. I believe long ago I read they were stronger than the earlier ones. Alex

I know new replacement rocker faces are not necessarily parallel with the bushing , new rockers should be refaced . From my experience very early engines used "B" rockers and '72 , '73 used the delta .

It’s my experience the the Delta & B rockers are later, like for large journal cams with a larger foot. Early rockers have a smaller foot and no markings.