One of the easiest ways to tune an engine's performance is with the intake manifold. Yes, the camshaft can have a bigger role in horsepower production, but a camshaft swap includes real work and more ...

Horse Sense:The more we test the GT-40 intake manifold, the more impressed we are. It's well over 15 years old and it's still being compared to the most contemporary hot-rod intakes. Not many cams, ...

We recently spent a couple of days dyno-testing several different rocker-arm ratios on our 470-inch Mopar big-block. The good news was the engine made 700 hp on pump gas, but we were disappointed when ...

Editor's Note: As inanimate as intake manifolds may appear, they provide a path to both major and minor on-track power gains. Selection is one thing; "tuning" them to specific applications is a blend ...