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Re: First truck project! 89 Silverado 5.7 350 V8!
The ones I bought from ebay instainless for $122 shipped fit directly in place of the stock manifolds and the top side is a very thick flange has to be at least 3/8 or so. The collector is thick as well and as mentioned uses no gaskets it's ball end to fit in place of the stock manifolds and bolt to stock pipes without a donut gasket. I love em.
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