Originally Posted by Gumby
Previously they were 3/8" with welded on washers to bring the bolt locations to the correct height but since I'll be making these out of 1/2" it allows more flexability in the thickness of the flange. My preference would be to make them a touch thicker (.4 - .45") to help prevent warping while welding.
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What's really important is that the flange thickness under the bolt heads is 12 mm (.472") thick to match the intake manifold thickness and ensure good sealing of both manifolds.