I have c6 05 z51 and I install Kooks headers 1 7/8 with 3 x pipe, SLP under drive pulley, and vararam intake, and I’m thinking to install cam, I’m using my car on a daily basis, I need your advice about which cam should I install ?? do I need to change the rocker arms too or it’s not that important ?

Thanks folks.

 

I'd go with the Comp XER273. Great power and great driveability. I'd say do the rocker arms at the same time. Go with Harland Sharpe 1.75 rockers, they will put you right where you want to be with this cam profile.

Ed

 

Before anybody can give you any advice on a cam, you'll have to give more info.
How much HP are you looking for? Everybody wants a lot of HP so be realistic in your estimation.
What kind of drivability are you looking for? Everybody has a different definition of "good drivability" because it all comes down to opinion...and you know what they say about opinions. One person might love a cam with lots of lope that hits hard/shakes the whole car while another person would immediately turn the engine off because it's intolerable to that person.
How often are you willing to change valve springs? With the XER273 cam and 1.75 ratio rocker arms recommended above, you'll be at .598" lift on the intake and .605" on the exhaust. At that lift and with your car being a daily driver, valve spring replacement will become a part of your car's maintenance.
Do you care about MPG? Since your car is a daily driver, I'd guess it'll matter at least a little bit.
What are you planning to do with your car? Maybe you plan to drag race it every Friday night or you just want a little extra punch on the street. If you want a little extra for the street, you might be better off with 1.8 rockers on the stock cam with a better intake manifold. The 1.8 rockers will give you a little extra "effective" .050" duration too.

You have to be honest with yourself and realistic when you answer the questions above or you'll be very disappointed with the outcome.

 

Maybe a Moderator can add these replies to the OP's other thread with the same question.

Here is the thread:

http://forums.corvetteforum.com/show....php?t=2080560

 

Thanks alot Ed

 

Thanks alot glass slipper for the Great thread ,the answer fo yor questions as follows:

1-How much HP are you looking for? 400 or 420hp.

2-What kind of drivability are you looking for? I don’t love the cam with lots of lope that hits hard/shakes the whole car .

3-Do you care about MPG? Since your car is a daily driver, I'd guess it'll matter at least a little bit.
(actually I didn’t understand what the MPG is stand for).

4-What are you planning to do with your car? I just want a little extra punch on the street.

 

MPG=miles per gallon

 

I made 427 RWHP with the Comp XER273 with the rocker arm combination I mentioned earlier on a customers car. It had the stock intake (Ported), headers, the cam and rockers. The cam does have some lope to it when tuned properly, but not so much that it's obnoxious or unbearable. When tuned properly you'll gain fuel mileage when on the open road, but at Wide open throttle I've never had a customer care about mileage. The right choice of cam will make your engine more efficient. This cam has a lot of punch without the horror stories of most larger lift, duration cams. Let me know if I can help out any more.

Ed

 

I would keep stock rockers and go with a cam designed for your stock rockers. Many have added aftermarket rockers and they see dyno numbers increase but they don`t see any gains for et/mph at the 1/4 tracks. Now i won`t say that they don`t add power, but there haven`t been any threads of them working for the 1/4 on the C6`s.

Thats what my tuner(Cartek) suggested and i haven`t seen one downside to the oem rockers.

Make sure to do alot of searching and reading before you decide either way.

 

Thanks alot Ed , i appreciate it.

 

Can you tell me where can i find the designed cam for my car withe the stock rockers ?????

 

As he said, get the XER273HR. Lingenfelter sells it as does Comp Cams directly. It as well as just about every other cam works with the stock rockers. It produces 410-425rwhp. Minimal lope. I have had it in both my C5 and C6. I've had a few cams in both. I still like that one as a work horse recomendation.

 

You can definitely use the stock rockers with that camshaft, but what for. A nice set of Harland 1.75s are going to reduce friction and give you just a touch of lift and duration at the same time. The contact point between the tip of the valve stem and the face of the rocker arm is one of if not the highest friction point in the motor, why not reduce that to as much as possible. If you have the car apart already its the perfect time to install the new rocker arms. In the end though you don't need to go with the rocker arms it's just a suggestion, but I'd go with that cam hands down.

Ed

 

I have made VERY good power on a couple ls2's with my RPM-2 cam. Its a semi mild cam and i have made 455hp and 419tq on an 05 C6 with kooks long tubes, corsa catback, and an underdrive pulley. I also made 458hp and 429tq on an 05 gto with kooks long tubes and an underdrive pulley. Pm me if you would like more info.

 

Thanks alot SpinMonster

 

i appreciate it Ed

 

PM sent.