GMC Envoy Cylinder Head

Understand GM’s AFM system—how it operates, it’s pros and cons, common lifter failures, and your options for tuning, disabling, or full AFM delete.

Need help selecting the best cylinder head gaskets for your engine? Click here to learn the differences between copper, steel shim and MLS head gaskets. Plus install tips!

Learn how to re-build a junkyard Small Block Chevy. A step-by-step guide on how to select a SBC, machine the valve guide bosses down, and what parts to use to upgrade to your personal liking.

Engine Cylinder Numbers

Whether you’re looking for performance improvements or heat reduction, if you decide to wrap your headers, we'll show you the benefits and possible precautions to take before you wrap your exhaust.

Whether you're trying to troubleshoot engine issues or want to get an idea what's going on inside that junkyard jewel that you just hauled home, a leak down test is a great way to ascertain the condition of an engine's cylinders without pulling it apart.

Leaking engine cylinders is an important preventative maintenance test to do while racing. Learn the steps to perform this test and how to indicate proper engine tuning.

Watch our video on the ceramic coating process for Armor Hot Coating. Headers coated with Armor Hot Coating protect your car without sacrificing looks.

In this budget build, a GM rear end is upgraded in order to hold 400+ HP. See how spherical bushings are replaced in a used 8.5” GM 10 bolt rear end.