Many people will not think they have a head gasket problem because they are not seeing any smoke out the exhaust or smell coolant burning. Almost anytime you have a head lift even just once, you have compromised the integrity of the gasket and you will need to replace it. This is a common failure on higher horsepower engines that create cylinder pressure that overcomes the clamping load of the stock head bolts allowing the head to lift. This can also occur under high horsepower/boost situations.Īs you can see from this picture of a multi-layer gasket, if the gasket is allowed to expand anywhere between the head and the block, you have the potential for leakage. Over time as the head/block surfaces warp and the strength of the head bolts weaken, the head can lift causing combustion pressure to go directly into the coolant system. The gaskets in all years of 6.6 Duramax pickups are a multi-layer steel style gasket. One of the common issues we see with the Duramax engines is head gasket failures.
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