Loyal HRM readers will no doubt remember our "Ultimate Chevy LS Cylinder Head Test" in the Dec. '10 issue in which we tested 11 different LS1/LS6 cathedral-port-style heads. In this issue we're doing ...

In its infinite wisdom, Chevy saw fit to design the LS3/L92 LS heads as a direct bolt-on for the early cathedral-port motors, at least those with sufficient bore size. The LS3 motors featured a 4.065 ...

"Yeah, cool, but those engines won't last." As the LS1 pioneers continued to identify and work around each successive performance bottleneck (remember the excitement around the LS6 manifold?), a ...

In the market for a huge power increase? Then you're probably looking at getting a set of ported aluminum heads on your GM car or truck. Here's a sampling of what's available from the aftermarket ...

Ever since humans started using motor cars, they have undergone massive transformations, makeovers and evolutions. Every part of modern-day vehicles is a highly advanced version of what was used in ...

Cylinder head porting is one of those garage mods that lives somewhere between speed-shop legend and flow-bench science. Also referred to as port and polish, the idea is simple: Open up the intake and ...