Ok guys, I found these performance heads they sell for the 2.2 Cavelier and it fits on our truck, cuz it is the same engine, my question is i want to know how much of a horsepower gain it is. It is ported and polished, equiped with stainless steel valves, and is milled down for optimum compression. I remember people from other s-series forums saying they had their head ported and polished, and i was wondering what the outcome of that was for their trucks. I thought i remembered them saying it was a fairly large horsepower gain. Any input from them would be great.