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Re: What Header Gasket?
Use a gasket that matches the Port Shape of the header. Fel Pro Performance gaskets # 1426 or Mr Gasket Ultra Seal #5907 will give excellent results. There are others as well. Square gaskets will not seal at the corners on the round header flange. After running the engine through a heat cycle go back and tighten all the header bolts. May want to do that several times. You should be leak free at the head. The collector gasket and sealing can be another area of concern.
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