hi;
its kinda hard to guess and it will be different if you are adding an intake and/or headers too. if you just add those parts to a stock system and keep the compression the same you might gain around 30 hp. you likely need to mill those heads around .028" to increase your compression close to what it was. this will help.
its kinda hard to guess and it will be different if you are adding an intake and/or headers too. if you just add those parts to a stock system and keep the compression the same you might gain around 30 hp. you likely need to mill those heads around .028" to increase your compression close to what it was. this will help.