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95 S_Trucker · 02-29-2020, 10:19 PM

Intake gaskets are common. Head gasket failures are relatively rare. The gunk is from someone mixing dexcool with another coolant in the past. It will take a lot of flushing to get everything clean.

02-29-2020, 10:19 PM	#2
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,178	Re: Sonoma 4.3 Vortec Intake/Head Gasket Replacement Intake gaskets are common. Head gasket failures are relatively rare. The gunk is from someone mixing dexcool with another coolant in the past. It will take a lot of flushing to get everything clean.