Hello. I am new to the forum and need some help.

I have a 69 Mustang with an FE Motor I've rebuilt. It has Performer RPM Heads and matching Performer RPM Intake Manifold. The installation instructions with the manifold say NOT to use the end gaskets for the intake manifold. I followed the instructions and used RTV. I put a 1/4" bead across the rail and if anything was too generous with it. I've put about 3-4 hours on the motor and today when I brought it to operating temperature it started leaking from what appears to be the front driver's side corner of the intake. It is coming out fast enough you can watch it flow.

Now I am second guessing whether I should have used the end seals. The problem with using a 1/4" bead is there could be a void somewhere in it because it is being applied so thick.

I have a relative who says to use the seals but apply them and let them set up before coming back and installing the manifold.

I am interested in the forums' opinion. I've searched and can't find anything specific on the FE motor. I've read some say to use Right Stuff.

I don't think this leak is something I can fix without pulling the intake again. So I really only want to do this one more time.

Any advice?

Thanks.