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 ...

Over the past few months, we've stated in numerous articles (including our tech feature on Grump's 331-inch Chevy) that the main reason for the horsepower gains enjoyed by many of the Modified and Pro ...

An internal combustion engine is like a big air pump, and the more air you can get it to pump, the more torque and horsepower it will make. Things like bigger camshafts, aftermarket intakes and ...

Dart says its As-Cast heads are "...for the commodity kind of guy, who wants to make between 500 and 800 hp, depending on displacement or power adder." The two new heads are known as the 170 As-Cast ...