I've never had one of these engines open, or any British engine for that
mater. But, based on my work on American and German engines, I will make
these comments.
Three bearing caps, means you have 6 potential combinations (12 if the caps
can be turned end-for-end). But (if I understand you correctly) one cap has
a wider bearing width. This wide cap should be easy to locate. That is, if
the cap is wider look for the crank journal that is also wider. This leaves
you with just 2 caps, and thus only two combinations (4 if they can be turned
end-for-end). You already did away with 66% of the possibilities!
Put the two remaining caps on randomly for now. Do NOT install the bearings.
Install the bolts and tighten the caps snugly (you don't need to use a
torque wrench, just make the bolts tight). Now check the joint between the
cap and block very carefully. Run your fingernail across the joint to check
for an "edge". Now swap the caps and check the fit again. If the caps can
be rotated end-for-end, then rotate them and do repeat the checks again.
NOTE: If you have an inside micrometer, you could also check the "diameter"
from the block to the cap. You can see if this varies with cap location, and
pick the location that gives the most appropriate diameter.
If they seem to fit best in one location, then you are all set. I suspect
you could detect as little as half of a thousandth of an inch of mismatch
(0.0005 inches). Since bearing clearances are probably 3 to 4 times this
big, if you can't detect a mismatch, you are likely OK.
However, if you want to be sure, then put the caps on, mark their location,
and have the block line-bored -- if oversize bearings are available.
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