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!

Asked by Apr 12, 2015 at 11:44 AM about the 1997 Chevrolet C/K 1500 Cheyenne Standard Cab SB

Question type: Maintenance & Repair

1 Answer

101,875

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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