How To Build An Engine - Build Your First Engine
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Before we address our valve seats, let's look at this severely hammered exhaust valve seat seen on another head in the shop. The pen points to where the valve head actually deformed the seat. Hillemeyer says that in his 30 years of experience, seat damage is typically caused by detonation, malfunctioning EGR valves, and overheating, not necessarily unleaded fuel alone. He says, "If fuel metering isn't too lean, the timing doesn't cause detonation, and the cooling system is right, it probably isn't going to pound the seats." View Related Article
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