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H22 and H23 blocks are identical. the only components that differ are the internal rotating assembly, balancer shafts, timing cogs, crank pulley, and oil pan.
the H22 also has oil squirters.
the H23 block merely has a removeable plug in the VTEC oiling channel.
depending on what you're doing, you can swap H22 internals and accessories into an H23 block and stick a VTEC head on it and it's a 100% H22 motor, except for the stamping that says "H23A1".
on the assembly line, the blocks come out of the same casts... some turned into H22's, some turned into H23's. pretty much just the internals dictates the engine code.
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