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Michael,
I actually removed the box & carbs to get an exact measurement of port centers in the head. Comes out 8 5/8". Your carbs must be off center a bit, your cylinder head has shrunk, or the measure has stretched due to weather conditions. Do you know about shrunken heads?
Really, I just measured a spare head, (the cars) not mine.
D
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LOLOL--
Aside from being a most knowledgeable and prolific contributor to this list you are actually getting a sense of humor!
Note that I said a STRONG 8-9/16". I was using an architect's scale that had graduations in 1/16" increments but expressed myself in carpenter's terminology. Now that you mention it my cylinder head is a DW aluminum and perhaps the rate of expansion and contraction of various metals needs to be figured in. Anyway, who needs a little head?