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Thanks Gordo, really appreciate that. You have to promise though not to laugh at my method of measuring! I also don't have a bore gauge the right size to measure the manifold ID. So I found some different size bottle caps that were close to the ID of my manifold at the narrowest portion. I found that one cap that measures 39.5 mm on the OD, passes through the narrowest portion of the runners with roughly 1 mm to spare. Another cap that is 41.5 mm OD doesn't fit. Hence my manifolds are approximately 40-41 mm in the middle of each runner. Substantially smaller than the base/opening which is 44 mm.
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