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All the ones I have seen are 7/16"-14UNC including the 1975 B20 block I had
in the celery wagon. It DID have metric maincap and bellhousing bolts -
M12 - 1.75 (which is about 14.51 TPI, by the way). I suggest you mike the
bolts and check them with a UNC (not metric) pitch gauge. Also note that
7/16" IS very close to 11mm 0.4375" compared to 0.433 for 11mm.
So the proof of the pudding will be in the pitch - It will be a little off on
the 14 pitch blade and further off on any other if it is metric. If it is
7/16"-14UNF the 14 pitch blade will be a perfect fit.
I have never seen an 11 mm bolt although they may make them. Most systems jump
from M10 to M12.
--
George Downs Bartlesville, Heart of the USA!
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