In the previous issue, we spoke with a number of well-respected companies that market high-flow Pontiac cylinder head packages, and each shared with us the detailed specifications of those aimed at ...

The idea behind this effort was to use one flow bench to test as many small-block and big-block Chevy cylinder heads as possible. By using one flow bench and the same test procedure, we eliminated ...

On average, a properly set-up engine can make about 2 horsepower for every 1 cfm of dry intake port airflow. However, that does not automatically translate to "bolt on better-flowing heads and make ...

The question of the day seems to involve the difference between the original cathedral-port and modern rectangular-port LS heads. More specifically, which one is better? Were we to compare two sets of ...