Original GM NOS # 3896929....casting #6930 with horizontal diamond, this cam was used in most small block chevy engines back in the day. In the Chevy parts dept. back in the 70s we referred this cam as the 327cu and 350cu-300hp camshaft. But it was used in 283s 327s up to 300hp, 350's up to 300hp and all sbc 400s. I worked in the Chevy parts dept back in 70s I know, I sold enough of these ;-) Any questions don't hesitate to message me thx Wayne