Some OE had a 1/8" hole in the top pass bolt and some had the angled drip tray & a guy said some had both. It is a drip oiling and I drilled a good sized hole in the retainer flat plate and a .015" hole behind that in the front pass mini cup plug in the front of the horizontle gallery for a constant squirt onto the chain and the same .015" hole in the rear 3/8 NPT pipe plug in the drivers rear of the horizontle oil gallery for a constant squirt onto the intergear (when you preoil you can see its function). Get an aluminum pipe plug & drill it REAL slow especially on steel ones like the cup plug & buy several of the .015" bits as you will likely break one especially on the steel front cup plug.