Andy, didnt we do a port map for the '16 overlayed with a '18 or have I been slack and we never did it?
If not we can do one in say about.... 8 days lol
The '16 exhaust port is almost the same shape as an '18 but has had it wings clips, Im sure if you're as knowledgeable as Matt you could port a '16 to the same spec but I think for most of us buying '18/21/28 barrels is easyer, and maybe alittle safer.
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If I have to take the carbs off once more...