Modified Intake Valves

There's a new spec engine option for the 2025 IMCA Modified season. Here's what you need to know.

Learn how to choose the right valve springs for your camshaft, the differences between single and dual valve springs and when to replace them.

Expert techs Austin and Pat talk about some of the race car body parts we have to offer and the aerodynamic benefits they can add to your modified.

This article demonstrates how to install a complete Winters quick change kit with additional parts including birdcages, brackets, and calipers for a modified race car.

Dual plane or single plane intake manifold? Which is the best for your project vehicle's engine? Learn the differences in our buyer's guide.

Keep your rear cylinders running cool in a high performance engine by installing a water bypass kit to the intake manifold.

Check out some cool overhead conversions to the Ford flathead V8 on display in the Museum of American Speed!

Learn how to convert an engine using a Carbureted LS Conversion Kit, along with tips for a smooth install. Read more on the manifold and timing control module, which comes with an MSD ignition control box and wiring harness.

Comparing GM’s LS V8 engine to the high-tech LT V8 engine. Which is better for your performance needs and budget?

How proportioning valves work, fixed vs adjustable valves explained, and how to reset a prop valve.