[quote=drdoug]'51Bowtie, to your question, here is a 261 block, driver's side view, showing the dowel pin pushed in for full flow filtering (green arrow). In this configuration, the two NPT threaded ports (blue arrows) must be connected either through a full flow filter or at least with a length of pipe or hose, 1/2" ID, in order for oil to reach the oil galleries and bearings.
Yep, now I remember. Thanks Doug.
