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Old 04-07-2020, 12:22 PM   #7
OL SKOOL
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Join Date: Feb 2010
Location: rochelle il.
Posts: 356
Re: Sonoma 4.3 Vortec Intake/Head Gasket Replacement

Those injection spiders always get that black grunge on them. If they have any miles on them. I have used Dawn dish wash soap have had good luck with it . Put a flushing tee in heater hose and flush while running. They are famous for intake gaskets. Usually when head gaskets go they over heat.
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