I tried search but couldn't find the answer. A couple months ago I replaced my intake manifold. It still leaked oil. So, I'm doing it again. The FELPRO gasket set I got today has the back water passages completely blocked, the FELPRO gasket set I got last time had them blocked but with a small round hole in each. Which is correct on does it not make a difference. I do not want to have to do this a third time. Thanks in advance.