Spark plugs that haven't been changed for a long time can become one with the cylinder head. Fortunately, it's possible to repair damaged threads instead of scrapping the head. (Photograph by Chris ...

There are several ways to tell whether or not the spark plugs on your vehicle need to be changed or just adjusted and replaced. How often you replace spark plugs depends on the type of plugs you have.

Occasionally, spark plug threads are ruined by being stripped or burned out. When this happens, a product like these Phillips locking inserts comes in mighty handy. These neat threaded inserts can ...

A cylinder head, especially an aluminum one, seldom fails on its own. Typically, there's another matter to contend with. Undoubtedly, the most frequent cause of cylinder-head cracking is an overheated ...

Few things disturb us more than the bewilderment of a broken bolt or seized pipe plug in a casting. You’re at a loss for how to get the darned thing out. This is when you have to slow down and come up ...

A healthy ignition system is key to a car's overall efficiency and power output. If any of the components that have a hand in lighting off the air/fuel ratio are damaged or worn out, it could mean a ...

For hot rodders, spark plugs are often nothing more than inspection tools that reveal whether an engine is running too rich, too lean, or just right. Street guys look for a nice tannish-brown tint on ...