I have noticed a very small coolant leak since I pulled my oil pan and have the nose of my car in the air. Engine is a 400 based stroker, oil pan is off the motor...

I have noticed a few drops of coolant per day on the ground right under the pass side rear of the motor (under the rear main seal retainer). I cannot seem to find where this is coming from.

I checked the freeze plugs, heater hoses at firewall, at valve, heater box drain, and water pump housing. When I drained the oil and dropped the pan, there was no sign of antifreeze in the oil.

Anything I am missing? There are no plugs on the back of the motor where coolant could leak, right?

Any ideas of what else I could check??