I have a 5.0 L mustang engine in my 32. It has Trick Flow aluminum heads and ARP studs and nuts instead of headbolts. I bought this engine as a long block and it has been sitting for about a year since being built. I got it running last week but noticed oil leaks coming from between the head and block at the back of the engine. I know it is not the intake leaking.

My question is where could the oil be coming from ? Do I have to pull the heads and re-gasket or is it possible the oil is coming up the threads of the head stud ? To my knowledge there is no oil passages in the head correct ? I thought the head got its lubrication through the pushrod.

Help appreciated.