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This suggests that an ohv BT will not fit without fairly major frame surgery. The "45 magnum" certainly doesn't fit, nor does the British variant of fitting ohv Matchless heads and barrels. I've never seen an ohv BT in a 45 frame; I've seen occasional VLs, which look similar in some respects, fitted with knucklehead engines, but this also requires considerable surgery
The next problems would be;
(1) the primary drive doesn't match, for alignment or size
(2) the 45 transmission is highly unlikely to be able to handle the power
(3) the BT transmission probably won't go into the available space
apart from that you should have no problems.....
I'd suspect that the 45 transmission ratios would not suit the larger motor, quite apart from alignment issues, and the ability of the mounting and cross-over drive pattern to cope with the increased torque would have to be suspect ( best configuration is the primary and secondary drive on same side with all 3 hubs in a straight line, as per raised gearboxes on BTs as a racing mod )
given that very few custom bikes do any serious mileage or real work, you could probably get away with pretty much anything if that's what you really wanted to do... but it would be a shame to cut up increasingly rare and expensive parts for that sort of reason IMHO
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