| to verify the source of the loss in compression? From what I recall, the problem may be two-fold. Yes, #5 cylinder typically runs hotter which could be due to coolant flow but could also be due to fuel cavitation/starvation in the #5 cylinder since it's the last one in series before returning to tank. Even though you don't need to use the heater because of your climate, it's still a good idea to mix some antifreeze in with the distilled water to prevent corrosion. Plenum design may also contribute to this as well. Remedies:
-Modern (quality) standalones can tune/adjust per individual cylinder
-use a "Y" fitting to feed both cylinder banks individually (parallel flow rather than in-series). The jury may still be out on this idea though; inconclusive.
-proper antifreeze mix and flush periodically
-bore out/clean coolant passage flashing in your rebuilt block
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