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ok I'm not certain if I measured the correct points but I went from the inside edge to inside edge where there is the small bevel at the edge. It appears to measure 94mm I don't have a fancy caliper set but did measure with a very good quality wood working tool. Sorry that's the best I can do. The heads don't appear to be machined.. so far as I know they are ported 930 heads.
still available to first serious buyer or off to Ebay
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