Well iv been doing some reading and research but I need someone with some experience with the cams..what im looking to do is put in some comp cams part #113300. The saleman said they are the second biggest for N/a..now I know I will need a tune, and the valve train or springs ? Will there be any other internal work to make these cams run smoother? Iv been told putting a performance head in there would make cams work like they are suppose to..if truer what type and where I can go buy one...thanks

The cams and a tune will work. As for the performance head what are your power goals. With the larger cams I would recommend highly that you get new valve springs and retainers. Also what kind of car do you to give me little better idea of how to assist?

Am I working 03 Pontiac Sunfire 2.2ecotec? Need help on finding valve springs work comp cams parts 113300? call comp cams they can't answer my questions want is needed for this cams?