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Message: [QUOTE="thirdgenlxi, post: 652199, member: 10834"] The problem with doing the air test with the later models or those that have the newer standpipes, is you apply the air to the right (passenger) side oil rail through the ICP hole, but then the standpipes have check valves that keep the air isolated to that oil rail, and it never makes it back to the STC or the LH oil rail. I've had leaks from STC fittings and never been able to hear a thing, more or less just had to take the valve covers off first and inspect the dummy plug o-rings, and if they were OK then go back to the STC fitting. Unless of course you have one of the old style standpipes without the check valve to throw in there to test with. More times than not it's the dummy plugs, but still very well could be the STC as well [/QUOTE]

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