The space, or gap, between the center and side electrodes needs to be an exact distance across; otherwise, your plugs don't fire efficiently. Adjusting the distance between the two electrodesis called ...

When Ford introduced the SEFI 5.0L High Output Mustang in 1986 many predicted the end of the tunable engine. Ironically it was the beginning of a new era of super-tunable small-block Fords that would ...

All things lead to the spark plug. You can spend all the money you want in fancy intakes, cylinder heads, or engine management, but if you're not paying attention to the most important step in the ...

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 ...