It was time to tune up our 351 Mercury…again. The idle was rough and uneven, the power had dropped off, and the fuel economy had steadily gone from bad to worse. Frankly, we're tired of that routine.

The reasons for replacing an early points-type ignition system with a GM High Energy Ignition (HEI) system are endless. Not only will it clean up the engine compartment by placing the coil on top of ...

High performance is all about horsepower. But even the ultimate in heads, compression, cam, and the rest won’t make power if you can’t light the fire. Ignition systems don’t make horsepower, but a ...