All things under the hood of a car have an inherent delicate nature and require special tools and knowledge to fix, but there ...

Watch the meticulous process of restoring a 6-cylinder engine head, ensuring a flawless, smooth surface for optimal compression. See how precise valve seat replacement enhances durability ...

The lower end of the reamer was made to fit nicely in the guide for the valve seat. One of the plugs in the engine directly over the valve was bored out to fit the upper part of the reamer.

Hence the valve mU8't be free to seat itself under the action of the ... they are unreliable at high engine speeds, and the “timing,” or opening and closing of the valves, is uncertain.