New blended Header flanges for the B2x4 and B2x5 Motors

With the last batch of header spacers we also ran some 3d ported flanges for manifold construction. Designed for 1-1/4 sch10 pipe. They are opened up to the gasket size so it would be wise to port the head a little. Should have them for sale on a custom basis if anybody needs one. Should be nicer than smashing the tubes to match the ports.

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