The Buick Century had a blown intake. Parts were on the car for a year, the intake doesn't flow. The only problem was that the new valve cover didn't seal the oil leaks. I heard someone say their rubber valve cover is not airtight. I brought a new rubber gasket that I'm going to apply a thin coat of sealant to. I had a water pump with a rubber hose that didn't seal until I used a thin layer of silicone to make the seals.
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