So, sometime before my motor was in the car my pistons must've contacted my valves, seeing as I have bent valves in cylinders two and four.

Oh well, this just means S3s and a ported head.

 

That blows man.
But you're doing the right thing, moving forward

 

MAP Head, Stick with S2's.

 

https://www.evolutionm.net/forums/ve...d-evo-8-a.html

 

its a 2.4, may as well go with big cams. you will never notice the drivability difference and will pick up power.

 

I have always wondered this but could never find any threads proving this was true. I presently have the S2s with a 2.4LR.

 

S2's....

 

Thanks for the support brotha. It's just odd as it had to have happened before the motor was in the car.

MAP head is too expensive . Curt Brown FTW.

Thank you Levar! Unfortunately I don't have those kinda funds at the moment. I'll reveal what I'm picking up below.

My thoughts exactly mayne.

I spoke with JohnBradley many a time about this beforehand and he verified that you will lose little/no low end on a 2.4L by switching from S2s to S3s.

Any reason why you say that brotha? I've always heard that 280s perform great on a 2.4L with little loss down low in exchange for great top end gains.




To update, I was planning on going with a Curt Brown head, but money is extremely tight as I didn't plan for this to happen at all, so I'll be purchasing mxguy above's head. Freshly rebuilt with SuperTech Duals, SS valves, blended bowls (where the power is made from porting on our cars), new lifters, and has only been cut once.

Also, I believe I'll be picking up Kelford 280s to go with said combo .

 

Very interesting with the benefit to gain on the top end. Thanks.

 

Are you going with a GT40R or bigger turbo now? S3's are not going to be the best cam if you are not going with for over 800whp.



S3 will not be ideal unless you are going for some crazy power. Most of the Stroker motors will want to stick with S2 cams.

Stick with the S2 for your power



From talking with Greg at GSC about my build he pointed out a few good points and was kind enough to point me in the right direction as to where I want to go with my build.

First I will more than likely be going with a GSC CNC ported head, with everything upgraded doing the Beehive springs with Titanium retains and over sized valves.

I was told that as for cams when you go to the bigger displacement blocks or stroker kits you can pretty much toss the S1 cams out of the possibility. The larger displacement requires at minimum more 1mm duration and more lift. total duration always helps here as well (makes the drivability a bit better).

He suggested that I go with a S2 cam out of the S series line up of cams that GSC offers. This will be great for the 400-700whp goals with a FP Black, GT35R or 6262 turbo and can be run up to 8-8.5k rpm. If you where to run a stock turbo or smaller FP HTA Green, BBK, or the smaller 30r's will run out of air on the top end so they will hit way to hard early and not be flat across the band and fall off above 7k.

S3 Cams are going to not be idea for I believe most of our turbo setups and being in the 400-700whp rang that most of us are in. The S3 cam is going to be great for the 800+whp guys and those running 67mm to GT42R turbos.

So after talking to some more it seams like there will be something in the works to come out later this year to fill in the gap between the S2 and S3 cams This cam is going to be a bit more on the strip/ track Racing design where 1k rpm idle will be needed since it is more aggressive. This will be great for the bigger displacement motor for sure and able to get even better gains of power over the S2 cams.

If I where you unless you are going for the 800+whp rang and running a BIG turbo then I would stick with your S2 cams for now or wait for at gap filler cam to come out

 

Good information.

 

Ideally I would love to pick up what will probably be very close to the S2R that English produced a few sets of, but honestly, S3's work great on 2.4L's, as the bigger displacement pushes the powerband left, so drivability doesn't suffer. I've seen quite a few cars on here make the switch to literally lose nothing down low or in the midrange, but pick up power up top.

I see what you're saying, IVGSR, and if I had a 2.0L I would never make the switch. However, I think the S3s (or Kelford 280s), will compliment the port work in the bowls and the 2.4L nicely, without a loss down low. If I see a 200 rpm loss in spool that's more than worth it for what could be 50hp up top at a higher power level.

 

Why S2's? Experience, that's why.

Not to mention, you already have them.

 

Ie. did you change from S2s to a 280 and lose power or something? I can just as easily get Kelford 280s right now without losing a dime, that's why I'm asking. Not saying your wrong by any means, but I've been hearing otherwise, so I'd like to hear what you've seen that you didn't like when making the switch.

 

Do you plan on making 700+whp ever?