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Outstanding Dig, Jeff!
I have done some casual reading: car mags, the net, etc.
on octane req's and that "engine" kept coming up in some
of the more esoteric links...I never dug further and supposed
it, tha engine, was used "then" and not now.
Very interesting...and now I can do a little more digging and
reading! Thank you.
BR, Ol'UncMotor
PS: 600 CCs with 4 carbs sounds like a few M'cycles I know!
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