Ok I'm pretty sure I'm not gonna do this but let's say I added a set of trickflow 170s or something similar and left the ported stock lower intake instead of getting a $700 higher flowing intake? My cam has a 512 lift on both in and exhaust. I realize that making power is all about the combination of parts and that I'd be leaving alot on the table w out new intake but how much would you guess the heads alone are worth w my cam and ported lower? Would you say between 10-20 or like 40-50 hp gain? And second question: since its all about matching parts would I make more power using a head like gt40 or something similar w my ported lower than say the tfs w same combo? Or would the tfs beat the gt40 w same intake? And can we keep the replies relative and not tell me to buy a systamax or at least an explorer intake? I'm mainly just wondering what heads would do as is