What kind of valve covers are you using? Are you still running the tube from the pass side valve cover to the throttle body? What happens when you take the oil cap off while running do you get the same effect? Have you checked manifold vacum at idle and WOT. Do you get pressure or just vacum? It almost sounds like you have an oil passage blocked somewhere and oil cant return to the pan quick enough. I heard of an FMS A-4 block come directly from Ford with no oil return passages drilled out. OOPS.
Brad
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93 GT 306 DSS, O-Ringed, AFR 185's, Pro Products Intakes, 55lb low imp inj, 80mm Pro-M meter, 2004 PMS, AFM Power Pipe, Kirban Reg, Vortech S-Trim 14lbs. No times yet. Trying to tune.
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