[19bonestock88]

So the first step in improving engine efficiency is to improve how it can breathe. In addition to having the head ported by a well reputed shop I also plan to switch to the better flowing intake manifold found on the 2006-07 2.4 (LE5) Ecotec over my ported stock manifold, and the throttle body from a 4.3 Vortec V6 (I think 96-03). In the dirt track community the intake manifold is a bolt on increase of around 20hp and the throttle body is good for between 5 and 10. I also plan to replace the factory airbox (although mine is ported) with a 3.5” fender well intake. The reasoning is that the airflow path through the airbox is almost a 180 degree bend and the fender well intake will reduce that to a 90 degree wide radius bend. All these breathing improvements will likely shift peak power higher in the rev range but that will be discussed more in the second chapter

Less airflow restrictions mean less pumping losses right?