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[quote]QUOTE: Originally posted by Mark W. Hemphill Eric: EMD engines use a simple designation system: So: A, B, C, D series crankcases -- all 567 cu in displacement per cylinder, though you can stick a 645 assembly into a B, C, and D block. Dunno if you can do that with the A -- never have seen one! A BC block is a B block partially modified to C standards to get rid of some of the internal water leak problems with the C. BCs were VERY common; most railroads modified their B blocks during overhauls. 16-645Cs and BCs aren't uncommon either, but you can't get 2000 horse out of them unless you're willing to install bigger radiators and accept the fact that they will fly apart more often. E, F series crankcases: all 645 cu in displacement -- same bore as 567, but longer stroke. G series crankcase: 710 cu in displacement. Same bore as a 567, stroked out even farther. H series crankcase: the 265 indicates its bore in mm; it displaces 1010 cu in. This is EMD's only 4-stroke. [/quote] Mark, I don't mean to sound like a know-it-all, but I have a correction to make. The 567 and 645 series power assemblies did not have the same bore, nor did the 645 have a longer stroke. A 567's bore is 8.5 inches, and a 645's bore is increased to 9 1/16 inches, stroke remaining the same at 10 inches. This is why 567 and 645 power assemblies are inter-changeable in the same block, thus you can upgrade a 567C or D (567's, 567A's, and 567B's have smaller top-deck area and heads) into a 645C or 645D. Also, the last SW1200's were built with 567E's (567assemblies in a 645 block) because EMD wanted to simplify production, and produce only one engine block (the 645). The 710 however is stroked out further than the 645, about 1 inch more, but still has the same bore; 9 1/16 inches. The cylinder liners and the entire 710 block itself is taller than both 567 and 645 blocks. This makes 710 power assemblies almost non inter-changeable with 645 assemblies (that is unless you want to do some serious work on the block first [:D]). Just trying to clear things up[%-)].
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