I am going to get the head built so I need some opinions as to which one you think will be better? I will be getting the 1mm over sized valves.

 

I would go Ferrea...
dont have a clue about the difference...
but most of the high powered evos use it...like turbotrix.
thats a good enough reason for me

 

I have used Ferrea in many other applications. They manufacture high quality cylinder head components. A very good choice indeed

 

I flowed the stock valves and the Ferrera valves the Ferrera flowed more cfm. I put in Ferrera...

 

Ferrea

 

I had the option of going with either when I ported my head - I chose Ferrea.

Unless you are going to run a lot of (> 30 Psi) boost I would recommend not going 1mm over and sticking with stock size valves.

Who's porting your head?

 

Ferrea is the shizzel

 

why not to go over 30psi with 1mm oversized?
doesnt turbotrix use ferrea oversized an they are over 30psi

 

Yes this is true. I would like to hear why not to go over 30lbs boost also..

 

no what he is saying is that unless you are going over that (30 psi) you dont need oversized valves

 

You're misunderstanding me. My recommendation is not to go with oversized valves unless you plan on running high boost. It is possible to get too large a port job for your application.

I'm running a ported head w/ a stockish turbo (10.5 backhousing) and to be honest I believe that porting has made my engine laggier down low. I'm running stock size valves and a street port which is not that aggresive compared to some. The restriction in my setup has essentially become the turbo.

Exactly. I was told this by the company that ported my head. It would have only been marginally more expensive for me to go with oversized valves, so it was not a question of money, just what best fit my application. This company (Portflow) has been around for a while and are quite reputable. They did beautiful work on my head. For additional info on them see attached: http://www.portflow.com/frame.htm

 

We dont use ferrea valves. .. but they are 1mil oversized.. They are good valves though ....

Mark
Turbotrix

 

which valves do you guys use?

 

also would like to know this

 

Ahhh im not sure ..to tell you the truth .. i think they are SI valves ..thats why i didnt mention it.. I just know they arent ferrara

mark
turbotrix