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So, I measured the thickness of the 3FE exhaust manifold (16mm), and the thickness of the original intake manifold (10mm), and created three aluminum shims (6mm) to place b/w intake manifold and engine. The order I put everything on was engine, manifold gasket, shim, gasket paper, then manifold...

Good morning, I have a 1987 fj60 with an exhaust leak, and have been researching headers vs existing manifold vs the 3fe conversion. I am leaning towards the 3fe option but have a fitting question. My understanding is the 3fe manifold is 15mm, and the existing intake manifold is 10mm, so some...