A 1987 Chevy Suburban powered by a 350 V8 developed a persistent coolant leak caused by a deteriorated intake manifold gasket. The intake was pulled to clean baked-on port sludge, inspect aluminum ...

Since the days of relieving flathead Fords, we've known about the advantage of porting. Grind those critical passages with the right touch, and airflow through the engine improves-and with more air ...