Intake Leaking Oil

Are you using the same bolts?? Like I mentioned earlier, if you are, they quite possibly are bottoming out before enough torque can be applied to seal.

bobscuda67 said

I chased the head bolt holes and cleaned the bolts. Everything is ok.

Everything may seem OK, until it's time to torque the intake. Again, it's been milled. If those bolts are bottoming out without being able to pull the intake to the head, it ain't gonna seal.


If I'm thinking about this right, that means the top of the intake port has more clearance
than the bottom, but it's leaking at the bottom of the port and not the top. Seem's like it would be the other way around.

Again, the intake is resting on the china wall, it has to have some clearance. Remember the pictures I posted before in your other thread (factory heads and an unmolested LD340 intake), there was 3/16's of an inch between the wall and the bottom of the intake without gaskets--5/16" with gasket just resting there.

Click to expand...

Here is what I would do. Install a couple of bolts on both heads and snug them down (not so tight as to crack anything on the head), measure the distance between the underside of bolt head to the head surface. Now measure the thickness of the intake in those same locations and compare.

Next, I would have some of the intake milled off on each end so the is a small gap between the intake and the china wall. This will allow it to cinch down on the gas kets when you torque it down.

If it's leaking on the bottom of the ports, there isn't enough pressure there to seal it, because of the bolts not pulling the intake down enough OR the intake can't come down enough due to it hitting and bottoming out.

OR BOTH.