Tomos hi comp head leaking

Byron V /
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So my new hi comp head on a stock a3 is leaking on the exhaust side. I was using a 0.5mm metal gasket. Torqued to spec then a little more after I heard it leak. Tightened in a cross pattern. Puts out 150psi.

Any ideas? Tried it without a gasket and it still leaked.

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