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circle port exhaust manifold or header


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Soooo... yeah... I got a circle port head and I am wondering if my square port manifold is not adequate... Let me know! Is it ok to use the square port? Or I am looking for a circle port... Thanks!

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Square exhaust on round port head good. Round exhaust on square port head bad.

 

Square port manifold from an L16/18 is as good as a header without the problems of one. You will need a 2 into 1 down pipe to the muffler with the square port manifold. Round port heads only came on the L20Bs and they have 4 into 1 manifolds with a single large down pipe.

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