I think I have these same headers on my Falcon (5.3 LS). It'll be some time before I get any heat in the headers, but overall, I was very impressed with the materials (flanges/thickness) and welds. I mainly bought them because the manifolds I thought I was going to use presented too many problems. An added benefit of the headers is decent weight savings. They fit the around the block and bellhousing like gloves . . .
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