Cecil,
Top end oil travels from the rear cam bearing, through a small external copper tube, into the plugged hole you have shown and up to the center oiler (rockers).
Was this line removed for a hot tank cleaning...usually the hole would have been left open. Is there a corresponding plugged hole near the rear lifter hole? It sounds like you bought a naked block and don't know the history of it.
I think '49geezer' has a real good picture of this area properly plumbed. Where that picture is I don't know.
Stuart
Last edited by atomarc; 05/17/2008 4:17 PM.
