GM has filed a patent application a variable displacement valvetrain system with rocker shaft porting and insert sleeves for ...

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 ...

At Circle Track, we're all about helping you do more for yourself. But sometimes that's just not realistic. That's not casting doubts on the intelligence of our readership. Just like your mom, we ...

Superior Air Parts issued a mandatory service bulletin (MSB) for intake valves (part number SA539988). The MSB requires replacement of these valves used in Continental 470, 520, and 550 series engines ...

EGR stands for exhaust gas recirculation, and the EGR valve is part of a system that does as the name implies: recirculate exhaust gas back into the engine’s intake manifold for a return trip to the ...