I have noticed my oil pressure when cold is much higher after the completing the VLOM mod and even a little higher at hot idle. Is this due to the oil galley block off plug, my VLOM solenoids leaking prior, or maybe a mix of both? Not that I'm complaining, but just want to make sure the increase I'm seeing in pressure is accurate.
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If you notice an increase in pressure from doing the VLOM mod, that tells me your VLOM was indeed leaking. There is a much better chance of this being the case in the newer direct injection vehicles. This is because they are prone to having VLOM leaks. In fact, in the newer direct injection engines lifters typically fail because of the VLOM. The older ones typically fail because of lack of oil pressure during activation from some other outside issue. So if you have something that is pre-direct injection oftentimes one will find lack of oil pressure because of something bleeding off that pressure. For example, old worn out lifters that are squirting too much oil at the valve cover.