I have a 97 Chevy C1500 5.7 litre engine. I recently changed head gaskets and had timing reset and other few things done. Now had a whining noise that was evident in the plenum box (fuel meter body at top of spider injector), so replaced the plenum gasket. It was a bit better, but obviously still leaking air, and will quickly get worse, Point is, I can not seem to get this plenum gasket to seal!! I am next attempting to clean the inside plenum box with brake cleaner, and then lube with a touch of Vaseline, then put the gasket back on. Hoping this finally gets it, but any thoughts would be great!
Check the flatness of the lower and upper plenums where they seal I have seen a few of these warp making it impossible for a good seal. It also happens to the lower where they contact the head almost dead center of the lower manifold.
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