i replied once before but I'm going to add a few more points. apply red silicone under the seals,in the groove,just enough so as not ooze out.put some between the block and retainer and a dab on the seal ends then tighten down,this is where it leaks.put a little on the end of the side strips and slide in. but remember this whole area has to be dry, no oil what so ever or the silicone wont stick.let silicone cure for a day. done many engines and no leaks. this operation is just as important as all the big stuff and you can't be in a hurry.same as the oil pan,no oil, torque to factory spec's, no more drip pans on the floor. almost forgot,apply a VERY thin film of Vaseline to the crank journal surface before installing the retainer