dsddcd

That ruined the entire engine, other than the crank there is not much left.

dsddcd

I can agree with everything you said except for the standard valve statement. I can tell you first hand and many others will agree that the stock valves from the heat of FI, in my case the little Greddy, will warp. When I pulled my head all the exhaust valves were warped and when I started calling and talking with Laskey, IP, and many others they all agreed that a good exhaust valve should be utilized. As far as the seat is concerned that would be the next step however as you said this is no longer a budget build at this point.

With a new valve train included guides and machine work you are going to hit $1500.

I am still surprised that know one has set up a CNC process for our heads. I know that there are not large potential gains like the domestic heads I am used to but know one I found really stepped up to the plate with a good flowing head. The only sell with the S2000 head I could find was to add hardware for higher RPM and temperature. Now I had my head and TrboKev's completely reworked with new hardware then gasket matched to the manifolds, deburred and smoothed, rather than a deep port and I was very happy with the results though there is no way for me to quantify them. I also closed off the Air injection holes on the exhaust side as I no longer need them.

You can see in the combustion chamber that nearly no material was removed, and only a very slight deshroud was done between the valves. It should also be noted, that on the exhaust side there is a lip, see the scribed mark, intentionally left all around the head to help prevent exhaust gas backflow and with a cast short runner manifold, I think this will be imparitive.

neeman77

Yep, and to top it all off the little pieces go through the turbine wheel of your turbo.

dsddcd

Damn, I didn't even think of that, was the wheel trashed or did it pull through?

neeman77

No, it was ruined. You cant replace just the turbine wheel on a GT35R, you have to replace the entire center section. Cherry on top lol.

ERL_S2000

When I meant standard valve, I meant in size. My first setup had a 32mm Supertech exhaust valve. The first person I let grind them did a pretty terrible job.

ERL_S2000

Why would it be a waste? I did not work my head because of its flow limits. I worked the head to increase CFM through a wide range of lift. I will have to work the engine less as well as need to run less boost to achieve desired hp levels. Also a lot of money went into using CB seats to extract heat from the valves. Supertech valves worked out pretty well for me but head engine builder liked the Ferrea valves better in terms of cycle life. Like dsddcd said, heat takes a toll on the exhaust valves and anyone that wants to run endurance type racing or road will likely stress those parts out. So the point of this is not only to increase power. For 90% of people tho, I agree with you, keep it simple. What I was getting at with the 3 angle valve job is that I have seen 3-4 different people do them and have really done a terrible job. One has to be picky when it comes to someone touching your head but if done right can net good gains.

DFWs2k

Is this stuff still the best bang for the buck? Still on everything stock Ap1 engine w 90k, and want to make it more reliable. I won't ever go over 600 whp.

Spoolin

Yes