I used this Tilton pump. Specifically designed for
oil cooling - like gear boxes and diffs
I put two bungs into the
oil pan. They're not welded in, they're Russel bulkhead fittings. They don't leak.
And the pump is mounted to the frame rail here
I had a thermostat sandwich fitting. But it still had trouble getting the
oil warm while cruising down the highway. Even when the thermostat is closed, about 10% of the oil moves through the cooler. That's to keep all of the oil in the system at the same temp. That was enough to keep the oil temps down around 130-140*.
Another advantage is that the engine oiling system and the oil cooling system are completly seperate. No additional strain on the SV/SP engine oil pump. And no pressure drop through the system.