When you throw a lit match onto a gasoline-soaked rag, it ignites very easily. This is not an experiment I recommend or that is even needed. However, when gas so easily combusts, it’s hard to imagine there ever being a problem igniting it in the cylinders of a hot, high-compression engine. The reality, though, is […]

May 2008 was something of a milestone for me as far as the modification of cylinder heads for more performance was concerned. It was 50 years since I performed my first cylinder-head flow test. The technique  I used was crude, to say the least, but it worked. Looking back on it many years later, I […]

Before getting into the subject of physically modifying cylinder heads, let’s look at the history and basic logic and techniques involved with establishing a cylinder head’s number-one criteria: airflow. A working knowledge here allows a better understanding of all the head characteristics we are attempting to improve and how they may each affect the others […]