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I just got a new JC Whitney catalog, and they have a set for $179.95. The manufacturer is Pace Setter. Is anyone familiar with that brand?
If the header is for the 63-87 Chevy truck 230-292 engines they're probably the same as the Hedman and the Dynomax (just a different company name and logo). The primary and collector diameters, gauge of steel used and weld locations are all basically the same for all these type headers I've seen. Only the Clifford uses a higher gauge steel and has a thicker mating flange than the rest. They probably have use a different manufacturer.

-ftyler