I have been into y-blocks for some time now and seem to be plauged with blown head gaskets.It has happened on 3 separate engines.The latest one is 292 that has all fresh machine work,block has been decked and the heads have been freshly surfaced.it has happened with 3 different kinds of head gaskets.the first time it happened with felpro gaskets.the second time i used some no name brand .the third set is from Best gasket.the no name brand lasted almost 5000 miles.the best gaskets leaked after 500 mile retorque.I built a 292 for a friend and the same thing happened to him.this time both engines are leaking water into the oil,still has good comression.This has seemed to pop up after retorqueing the head gaskets after 500 miles.On both engines the head bolts were loosened and then re torqued to 80 foot pounds on the long ones and 75 on the short ones.assembly lube was used on the threads and heads.I tightened them in sequence according to the factory manual in three steps.first to 50 then 65 then the final reading.I have even tryed several different torque wrenches to make sure.I still have problems.Both engines have fresh machine work,I have checked for flatness and both are ok.What am i missing?Im so frustrated that I almost ready to give up on Y-blocks.I love the Y-block engines,but im loosing faith.

55 fairlane gasser 312 /c4, 57 f100 292/c4, 52 mainline gasser 302/t10 4speed