This rocker shaft is made of the same high quality, case hardened material as Good Parts roller rocker shafts but it has the OE oil hole configuration for stock or bushed rockers. Not recommended for needle bearing rockers due to the location of the oil holes and notches.
Do not confuse these shafts with a nitrided shaft. Nitriding hardens the surface of a softer material to a very shallow depth. Good Parts shafts are case hardened to RC60 minimum to a depth of .040" minimum.
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