I,m looking back into this now since I have to drain the cooling system for a hose leak,,I have a clifford intake with the water passage on the bottom, during other tinkering I took off the water heat, and when I went to put it back, I had a brownish thick fuel like stuff come out of the passage,,manifold crack?? can fuel saturate through the alum?? I heated the engine up and put compressed (90psi) air to the passage, held pressure,,I next hooked up a vacume guage to it,, nothing,, has anybody else had this issue, I contacted Clifford in case they had multiple issues, they told me no, and to put bars leak in the system,,(yeah right), they are expensive manifolds to scrap,,I've looked inside for cracks, I see some weird casting marks, but no tell tail cracks,,I used to see a red paint like stuff to cover lifter valleys, if I filled the passage and drained might that seal?? I think the paint smoothed the cast for oil movement,,
