Just rebuilt the engine and after the first start I noticed a little coolant leaking out of all 4 manifold studs. when the motor was out I did install 3/8" helicoils in all 4. I used permatex copper spray on the new copper head gasket. Is there a special sealant for this problem?
I use Permatex number 2 non-hardening for bolts/studs that may leak (just a dab on the threads, sometimes inside the block also. I use a toothpick). It seals well without hardening or gluing the bolt in. It also doesn't encourage the bolt to work loose. I have taken things apart after twenty years and it is still doing what it should.
Drive carefully, and enjoy, W2
Just read the label on the "RIGHT STUFF" from permatex and its good for 450 degrees but seems to be rubber based. Anybody use this stuff on leaky head bolts or leaky manifold studs?
Are you sure it's not the freeze plugs???
Any sealant will fix the problem. The Right Stuff will do it.
Larry is likely correct>
I removed the 4 head bolts that are near the 4 manifold studs and could blow air through the head bolt holes out through the manifold stud holes. Freeze out plugs not leaking. I used sealer on both the head bolts and manifold studs. I run engine for about 10 minutes yesterday. No ;leaks YET. Today I'm going to retorque head.
Glad you found it.
Wow somebody went deep with the drill & tap machine that day at the factory.