Red top boost leak problem!

[S13srdave]

Ok so I've been trying to trace down a pretty large vacuum/boost leak for a while. Finally got around to testing it today. First blocked off my intercooler piping, no leaks there. Reconnected the piping and ran another test. It took me a while to find it, but I'm leaking from the back left side of the head. Down below the valve cover. I can't see it, but I can hear it when I run a tube down behind that back side of the head.
I replaced the head gasket last year and used that copper sealant to help seal things up. I also used ARP studs that have been re-torgued since. The head was decked and I haven't let it overheat. Not saying it isn't my head gasket, but any other ideas what might be leaking back there? I'm going to perform a compression test and leak down test tomorrow and see what kind of results I get.

[S13srdave]

BUMP

[blkvrtswp]

I would suspect intake manifold gasket - either intake to head or intake to plenum. A bad head gasket does not cause boost leaks. Good news is they are cheap.

[Lobo240sx]

Check the intake or turbo inlet and outlet gaskets. If the nuts back out from the studs then all that heat is going to eat your gasket. I'd look at your brake booster hoses too.

[S13srdave]

Well, did compression/leak down test today. Results are not good.
Cylinder compression /leakedown results
1.111lbs, 25% leakage
2. 107lbs, 35% leakage
3. 105lbs, 30% leakage
4. 97lbs, 35% leakage
This was done on a cold motor, but still. I could hear leaking passed the rings in each cylinder.
Repeated test with warm motor. Got same results.