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I’ll take a look to see what the original block color is. If it is Johnson white, well, that means it’s either an early 60’s 18hp FD, or a late 60’s 20hp (which I haven’t seen many white 20hp motors but know they do still float around here and there).
With that fuel recirculator hose, that tells me it has to be late 60’s/early 70’s, even if in the wrong place. I’ll take a look at some other motors I have for comparisons and report back with findings. It’ll all get put back together the right way once I’m done.
The reason why I pointed out the timing plate on the magneto is because those ‘arc’ type ones seem to be only on the 18/20’s, the 25’s of course have that sharp angle at the top end to get some more RPM’s. So I doubt it’s a 25. I’m pretty sure the magneto/flywheel are all original to the powerhead.