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I've noticed a manufacture date cast into all 3 B20's I have around (two complete engines and a bare block). It is just above the oil pan flange, and the right hand side underneath the oil pressure fitting. Hard to see if an exhaust manifold and down pipe is fitted.
Usually the cam is stamped with a letter on the 'back' end of the cam - opposite the gear. I don't think that there is much of apattern to the numbers cast into the crank - I think all the different types come from similar cast blanks, and the grinding turns it into a particular type which is often stamped in the end.
The bottoms ends are reall the same, as much as matters, between B20B and B20E motors. Later on they changed the rod bearing specs (presaging the B21's bottom end by a couple of years) - those are distinguishable from the earlier ones by the number of bolts holding the crank on - 6 for early and 8 for late.
The heads are different, though. A B20B will not have any injector ports in the intake tracts, but B20E and B20F heads will. To distinguish between an E and an F head (the E is higher compression, and a bit more power), look at the middle head bolt on the manifold side of the head. If the machined surface stands separate from other machined surfaces, it is an E head. If it is connected to one of the adjoining injector mounts it is an early F head, if connected to both injector mounts it is a late F head. There is little difference in the stock performance of either F head, but those who know (i.e. John Parker) says the late F heads can be modified for more performance than any of the other styles (watch out for core shift though!).
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I'm JohnMc, and I approved this message.
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