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"...the cylinder walls are sleeved. Is this normal, or did a previous owner have some crazy work done..."
Don't know, good question.
"What is the stock spec on cylinder diameter?"
Also don't know and also a good question. It should be in any of the service manuals. (Haynes says 3.5"=88.9mm bore for the B20A engine and 3.5008"=88.92mm for the B20E engine.)
I bored out several B20s (both 6- and 8-bolt styles) to B21 diameters, and one was taken to B21 +0.060".
All ran fine. Superduper fine, in fact.
--
Don Foster (near Cape Cod, MA)
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