No 4.9L Cleveland or Windsor. He's looking for the header for the 300 I-6. If you're looking for a replacement manifold, the junkyard would be your best bet. I know they make a header for the 4.9L but I have no clue where to get it. I've heard from quite a few I-6 guys that the EFI manifolds give better seat-of-the-pants performance than a header and last a lot longer. The 300 makes a lot of torque down low and giving up some back pressure in favor of more power on the top end will cost you some of that torque.
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