To celebrate HOT ROD's 75th anniversary, we teamed up with CASTROL GTX to bring you some of the stories that exemplify the core of what HOT ROD is and reflect the brand's influence on America's car ...

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.

Port Flow Analyzer – now available from SuperFlow Technologies Group – is a computer software program designed to streamline recording, calculating, reporting and graphing of cylinder head flowbench ...

Cylinder-head port design and modification has been a source of speculation for as long as there have been internal combustion engines. Because engines are power-making air pumps, airflow volume and ...