Es2. 1951 plunger

Can anyone advise if there should be a gasket on the oil feed block where is is fastened to the rear of the crankcase by a stud. I have an annoying oil leak from the joint. On taking off the block there is no gasket. I have tried some goo put on very sparingly as I don't wish to block the oil ways. I have tried Norvil and several spares outlets bit am unable to did over the answer as they have none shown as a stock record. Any advise as to curing the leak will be welcomed and appreciated.