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12-05-2008
1. What is needed as far as head work/lifter modifications ect to run a cam with....
duration @ .050": 235?/238?, lobe lifts: .375"/.376", valve lifts with 1.60:1 rocker arms: .600"/.601", lobe separation angle: 116?, intake centerline: 112?
I see that thrasher offers a Spring kit that allowes up to a 595 lift hight. So what EXACTLY did they change to be able to run that high of a lift with stock heads?
So what ya'll got?
12-06-2008
They acomplish the added clerance by milling down the valve retainers and shorter valve seals. To do it right you should mill the valve guides.
Also to answer your first question , I dont think you can run that with out taking the heads off and having work done. That is quite a bit of lift... i belive it is or is similar to a IS4 cam so i would check to see what they say it needs
12-06-2008
i ran the TEP on stock heads with 130# spings and modded retainers and what not. mean? yes, very. the best setup? hell no.
you need ported heads for a big cam. if youre going for something with a lot of flow, you need someone that will flow with it.
stock heads? do an xp or s1x.
ported heads? IS3, XPZ, TEP, etc. do it the right way.
12-06-2008
Ok well that answers that. So are both the retainers milled? On each of the sides that the spring rests on?Originally Posted by Dawings33
So it's not piston to valve clearence that is ever needed to wory about with any aftermarket camshaft on these engines but rather....um how should i put this...Valve guide clearance issues?
Just out of curosity...
How would an engine shop get something down past the rim for the gasket to mill down the guides?
Maybe i'm just not understanding how this is suppose to work. But thats why i'm asking...Maybe i'm thinking of the spot on the head that the rockers bolt to.
12-06-2008
Why do you say it wasent the BEST setup? just because there is a higher lift cam out there? Or because of the spring and retainer combo that was used.
I wish that I had the money to buy you're heads bio. But when the time comes Ported heads will def be in order as far as im concerned....more than likley with bigger valves also.
I already have an XP and have stock heads also.
12-06-2008
the heads wont be able to flow what they should. to really use a big cam you need ported heads to flow what the cam wants.
youd probably get more out of your if you stayed with your heads/cam setup as is and adding the rest of the setup than if you were to just run a big cam on stock heads.
if you want to work out on a payment plan on those heads ill work with ya. i figure youre a pretty faithful kind of guy.
12-06-2008
Ok i'll consider it. Again i'll by no means be using stock heads with the build up that im planning on.
I was just mentioning that i have stock heads and an xp cam as of now.
What im going to do is get a different block and set of heads that way i can keep my car running since it is my only dd.
That way i CAN take my time and do things the right way like you said earlier.
12-06-2008
yup yup. ive been debating keeping them and building an l36 block on the side, but i keep thinking about getting out of the grand prix scene.
12-06-2008
When machining the valve guides down would that affect the installed height of the spring?
For instance when intense says this....
We always recommend and/or install 150# valvesprings at 1.800" installed height or CompCams 130# valvesprings at 1.750" installed height with this camshaft.
If the valve guides were milled down 50 thousands then intense would recomend me useing 150 # springs instead of the 130?
Someone explain this to me.
12-07-2008
milling the valve guides will not affect the install height. All that will change is the clerance.
12-07-2008
Ok i talked to someone on 3800pro and they said with the is3 they had to mil the valve guide's .175 to get .030 clearance. And that was when they were already using modded retainers.
The cam is probably going to be the last thing im going to get. But it's the hardest thing to decide upon. But if thats all i have to do then i'm probably going to get the IS4.
12-07-2008
if this is really going to bother you that much, pick a cam, buy a set of heads (stock), and take them to a engine builder and say that you want the heads ported to the specs of that cam.
either way, good luck with whichever you choose.
12-08-2008
my heads are have 150 thou milled off the valve guides local shop did it for $40 bucks for the pair.
Why are you so set on a IS3 or IS4? There are better cams to make big power.
12-08-2008
stay with the xp cam get some heads and spray it !!!!
12-08-2008
Thanks for the info. Hey if you can give me some suggestions on some cams that would be awesome!
Really all i have to go off of is the stupid hp dyno list on cgp.
So yeah any input would be awesome
12-09-2008
Well in order to pick a cam what do you want to run
Power adder? m90, gen 3, gen v, mp112, wipple, turbo?
Heads? stock, stock with minor port work, full port job?
Daily Driver?
Easy of drive? big lope that stalls, very easy to drive ?
Tunning? out of the box pcm, custom tune, ability to tune yourself?
Budget?
12-09-2008
I will be running a gen 5 by then. Heads will be stock with full port job along with the bigger valves.
Really don't care about the stalling,I want something fast. I'm pretty sure I can work that out as far as tuning goes.
I have a tuner and can tune myself.
Budget?....For what? Cam? I can't imagine spending over like 500 bucks for just the cam.But I don't even know of any that cost that much.
As far as a budget for the entire build I don't want to spend 5 or 6 thousand dollars on just the engine. I'll probably just use my block thats in the car now and save for a little 1500 dollar beater that i can get around in.
12-09-2008
I want to be able to run 11.5's on a 75 shot. Maybe off of one? Just dont know how possible that is. I don't know of a lot of people that run faster than me on here that have an m90 setup. So it's hard to guess at what will work and what wont.I don't have a lot of experience on what part combo's people are using to go faster than 12's with a m90 setup is what i'm saying.
12-09-2008
im planning on running what your PB is currently on what ive currently got in my car.
i just have to finish up installing my meth kit and then switch my injectors so i can run e85. then the tuning nightmare comes.
i figure if i get down to a 3.2-3.0 pulley and run 22*+ of timing and get a retarded good launch i should be able to pull that off. but then again, i dont want to use slicks either so that might be my hold up. either way im going for a low 13s street car, which i almost have already.
you may want to look into e85. 104 octane at less than the price of regular gas? im in. hell, you use 30% more of it, but if youre not going to drive it often or not taking it on any road trips then who cares? and if you do want to go somewhere or switch back to gas youve got the tuner to do it.
12-09-2008
Yeah. I don't think i'm quite ready for that. Even though they do have ONE e85 station in my city this is and may still be my only daily driver when the build is compleate therefore if I do go out of town and i can't find a station then i'm screwed. Ya know?
But if I do end up getting another car or truck I will def be looking into that.
Brian anderson who is the current wold record holder for ''the worldest fastest street car'' (wich is a rambler) and lives right down the street from me uses E85. I belive he has run the best of 7.20's?
He works on base and drives the car around the city a lot.
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