I'm going to be building the head on my Evo IX here in the next month or so, and I was also debating if I should go with different cams since the head is going to be out anyway. Right now the car has some Cosworth M2's with the following mods:
-Mil.Spec Ported IX Turbo
-Mil.Spec Ported TB
-Mil.Spec Ported Invidia O2 Housing
-Mil.Spec Ported Exhaust Manifold
-Aem Intake w/ OEM Intake Snorkel
-Arp Headstuds
-FP 18psi WGA
-RC1000cc Injectors
-Walbro Fuel Pump
-Megan Racing Downpipe
-Mil.Spec 100 cell HFC
-Buschur Magnaflow Catback
-Nisei Competition 3.75" Intercooler
-Nisei Licp

The head work will be getting done by these guys (Aby@Mil.Spec recommended them to me):
http://portflow.com/product.htm

MITSUBISHI EVO
STD. HEADWORK
disassemble/ clean/ inspection
port & polish
radius valve job
deshroud valves
polish chambers
surface deck
assembly/new seals included

I was also wondering if I should go to oversized valves or not? And if so, what manufacturer? Was also going to upgrade the springs and retainers but didn't know which company to go with either. My car is street driven and road raced quite often btw. I drive my car about 2-3k miles per month and track it about once a month as well.

Here's the power she used to put down:
https://www.evolutionm.net/forums/ev...-e85-army.html

With all these camshaft options i'm stuck of which set up to go with now as well Tomei 270 procams, New Cosworth SWB 280 cams, GSC S2's!? I will be staying with the stock turbo for the meantime but will be upgrading to a BBK Full or DBB FP Red sometime in the next year or so.

Any help would be greatly appreciated

 

Bbk-full, S2's, gsc Ti springs and retainers, call it a day haha
im not sure how those cams would be with the stock turbo though.
As for the valves, i have no clue! Haha

 

Nice Ben good luck!

 

Hey man looks good imo I would do Gsc S2's and Gsc chromoly springs and titanium retainers. As for valvei think oversized will give you a little more topend someone correct me if I'm wrong, if you do do valves I would do supertech or ferrea, ferrea being the more expensive route.

 

Oversized valves can hinder some spool but for a big turbo/big power setup it can compliment those setups well. Since you are on the stock turbo it may actually hinder performance as the turbo can't keep up as it will run out of steam a whole lot faster as the head is trying to consume more than the turbo can produce. You will typically see oversized valves on 650+hp builds and most people will not see this level. I think stock size valves will allow you to achieve your goals and allow your setup to run more efficiently.

 

Dont change your cams. Those cosworths are great. If you change them, pm me ill buy them!

 

ben for your setup you dont need oversized valves. If you wanna swap cams swap to the s2s and since you track it, id look into their beehive springs/retainers. As far as other valve train components, at your mileage I would do new rocker arms, valve guides and valve stem seals, have the valves measured to see if need replacing. Maybe have the head o ringed, thats about it since you push the car on the hot road course size tracks, to help keep the combustion chamber sealed.

 

- STD size valves. The big name shops have done the before and after... not worth it on a 1000+whp Evo... probably not going to change your life.

- GSC S2's or FP4Rs. Flip a coin. I'd get the GSC S2's from English Racing if I were you.

- Kiggly valve springs, retainers, and seats. This is the ONLY real choice.

- Kiggly HLA... you'll probably want to pick that up when you get his springs.

I like the port flow radiused valve seats, but I think they probably don't have the time invested in the port design like ForcedFed does. I might have forcedFed do the CNC work and have portflow do the seat and valve grinding as well as assembly/ finish work.

That's my recommendation.

 

Thanks for the input everyone, keep it coming!!!

 

as above s2's

 

Would you care to elaborate on that? I currently run Supertech duals on my Evo 8, what would/could be gained by going to Kiggly?

l8r)

 

consider kelfords, I really like mine.

 

We are big fans of the Cosworth M2's for IX along with the Superteach Duals!

 

Dual springs lose their damping ability as they wear in. Should be serviced more frequently than they probably are. (service = replaced)

I like the Kiggly's or PSI.

 

input? um, you still have my favorite avatar on the site.


anyway. are you going to be able to talk Bryan into doing your re-tune? or getting someone local to do it?