I know I have it - but finding is another matter. It's one of those ''I saw it a while ago'' pics!!
Be patient, and if I find I'll post it. .................
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Success! Thanks to a thumbnail appraisal of some folders. Member here, Diesle, who does not post often - had his .454 done. IIRC Magna-Port reduced barrel length and threaded and then added the front end - so I guess in a sense it has been compensated as much as ported!
Hmmm - seem not to be showing yet - I'll re-attach - still seems a prob, wonder if my end. Let me know if they show for you and if not I'll throw them on a server.