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what I did was tape off ALL oil galleries on the case half (except the one behind the jet) and squirt a little WD40 into the one open gallery (if I remember right, use the corresponding main bearing gallery) and blow with compressed air regulated to about 40 psi and watch for the WD40 to spray out.
It takes a little pressure to overcome the spring in the oil jet.
I had one that was blocked. I soaked it in techron and it cleared it up.
I am glad your checking these oil jets.
Hope this helps.
Chris
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