Quote:
Originally Posted by kwilson36
Are the 207 heads big port?...what are the main advatages as it relates to cams?. Is there any situation that you can bump up to a more aggresive cam and not have to upgrade springs, retainers, shims?. I always assumed that you could use the stock componants or at least be able drop the STi cam in without replacing everything.
I always subscribed to the theory that the heads where the real limiting factor on the USDM 2.0 and 2.5's making reliable big HP. Just not able to move enough air.
Curious?.
yes i think they are, i do know that in stock form, BONE STOCK form, they way out flow the WRX heads, and even better than MOST head mechanics will be able to flow them with just PnP jobs. Als, you can spin them up to 8000 rpms, or more, and also use AVCS. the WRX heads NEED the following upgrades to spin to 8000. underbucket shims, new retainers, new springs, and to make use of the engine speed, youll want cams. thats much more than just buying a 207 head and using that.
believe me, i went the hard route 2 years ago, and it blows dick! i have heads that flow well, for having stock cams still, and it cost me 2500 bucks or more. i did titanium retainers and dual valve springs, ported moderately with good flow, stock cams, and stock shims. I spin my motor to about 7700 RPMs because Ron at axxis power racing only recommended it take it to 7600. if i would have just bought the Gdamn 207 heads, i could be spinning my **** to 8500 rpms all day long, outflowing these, getting better spool with the AVCS, and making more power with a MORE efficient head. and it would have cost me less!