Did you have a gasket between your stock exhaust manifold and the Y-Pipe? If not did you just bolt the two flanges together? Any leaks at this joint?
Did you have a gasket between your stock exhaust manifold and the Y-Pipe? If not did you just bolt the two flanges together? Any leaks at this joint?
There should be a triangular gasket with a 3 hole pattern and center cutout for the exhaust pass thru.
Generally its best to order some factory GM gaskets as the headers generally come with crappy gaskets.
Tom
Upon closer inspection with a light I noticed the O-Ring is seated inside the Y-Pipe flange. I bolted the two flanges together and after starting did not find any leaks. Time will tell.
By the way what type of gasket was on the exhaust manifold to cylinder head? On the LS1, I have typically seen a 2-layer metal gasket used...pretty good stuff...especially coming from the factory.
Tom
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