What a cool picture! I would love to see the difference between the Fenton’s and the custom header in terms of how much more HP the header provides (and at what RPM) in an open exhaust situation. Everything else (with the exception of timing and jetting);being the same. I have a factory “Y” pipe for the later 250 Chevy used with the intergrated cylinder head. The 2 smaller pipes (2” In diameter) join the split manifold into a single 2.5 inch pipe. Holding the Y pipe up to the manifold shows that the 2 smaller pipes snake around to make it an equal distance from the manifold to the where they come together into the larger pipe. Having owned a pickup truck with that pipe on it those pipes were not routed for clearance reasons. After seeing the picture of the 3-2-1 header posted, could the factory be on to something?
