Modified Pistons

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

Learn how to lower a hot rod by modifying the axles and some history behind early hop ups. This project features a Ford axle with wishbones for a Model A.

Learn a few tips on how to properly mount Modified bodies and some products that will help get your race car body fabrication job done!

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.

In order to be competitive and win, it's important to find the right set up that works for you and your car. Here's some general reminders to remember during set up!

Devyn Peterson is an Auto Tech in the Speedway Motors Customer Experience center. He's also a racer, starting out in karts when he was just 5 years old. He moved up to a Modified when he was 13 and hasn't looked back!

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.

Get a good foundation on racing shocks and their different functions. Learn about the fundamentals and the pros and cons between various types of shocks available.

Choose the best piston for your engine build based on budget and power level with our piston guide

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