Actually my motor has a 2.0l head, with the 2.0 cam. and when I found an air leak on intake manifold gasket, I ended up making my own gasket. So when I was matching the gasket to the intake ports I used a rattail file and kind of ported slightly and then polished out all file marks for about the first inch inside the port. Did it help not a clue didn't really get to drive the truck but maybe one time before intake gasket change. I do know I have almost every jet available for my weber and I tried it I can actually run my truck with "NO" idle jets primary or secondary fuel economy sucks but it works.