Test data derived on a flow bench is measured in cubic feet of air per minute (cfm), and, as you will see, may not relate directly to horsepower potential. Beyond the ease of testing, the flow bench ...

Good cylinder heads are necessary to the production of serious horsepower, but what exactly constitutes a "good" cylinder head? Typically, we identify them with big, impressive flow numbers.

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 ...