A small gap with big importance in the performance and health of an engine - here's everything you need to know.

Time was when a valve job was done with some valve-grinding compound and a vacuum cup on a stick. But no more. Today's high performance engines require the same machining precision in the valves that ...

Straight pipes result in seriously loud exhaust noises, but in the right situations, they could reap benefits when it comes ...

Straight-piping promises raw sound and a shot of performance, but it also drags you into a thicket of legal, financial, and ...

From the October 1987 issue of HOT ROD: A Super Duty conversion kit that could give your Fiero the kind of performance its styling implied. Pontiac's Super Duty 4-cylinder engine has established a ...

It turns out that the stylish dual chrome outlets can do a lot more than just provide an eye-catching finish to a car's aggressive good looks. That's actually just the tip of the iceberg when it comes ...