What is the biggest cam I can use in a 99z with stock heads? I plan on an LS6 Intake , and upgrading everything in the valvetrain. I was looking at Comp cams extreme rpm
222 224 .566 .568 112LSA. Will this cam make good power with the stock heads or should I go with something smaller? What kind of #s should this cam produce? The car already has long tubes on it also. Thanks!

 

224/224 .581/.581 112 is what I thought you were gonna do. You should be able to get away with that on stock heads.

 

Yea, those numbers should be fine, that is what I am prob getting. I would expect about 380 with all the cam acceseries and LT's and some other bolt-ons and proper tuning.

 

You can go a lot bigger than that on stock heads as long as you change valve springs, which you should do anyway.

 

You can go with the TREX from TR or the G5x-3 cam. Its all about the tunning and the valve train. With all the bolt ons and a TREX or G5x-3 cam your looking at about 420 to 460 RWHP. Id go with something smaller for the time being. Im going with the TR224.

Its 224/224 .563/.563 LSA 112
I should be around 360 to 390 RWHP. (With all bolton's)

Goodluck with your choice.

John Melamed

 

I wouldn't go with a huge camshaft since you're running an auto. You'll need a huge stall to take full benefit of the cam. I'd recommend going with a tr230 cam, it's a reverse split and works very well with stock heads. I wouldn't expect anymore than 380-390 with proper tuning. The cars out there that have dynoed in the 420-460 cam only range are manuals which already dyno about 30-40rwhp higher(depending on how sloppy a stall the auto has) as well they usually are running uncommon boltons such as electric water pump, lsx intake, 90mm tb........

 

I planned on going with a stall anyway like 3000- 3200. Or do i need to go larger?

 

With a real lumpy cam, I think that you may need a stall that's at least ~3500 rpm (hell, that T-Rex cam calls for a 4000 stall! ) to take full advantage of the cam. But if you look at the specs for the T-Rex (242/248 - .608/.612 - 110 lsa 3500-6700 RPM Power Band) then I think that going with a cam that's only ~.560" - .580" lift, then you're safe.

 

I plan on going with the TSP 231/237 .598/.595 112+2.

I would like to put down 400+ rwhp NA and ~550 rwhp on the juice. I have a 3600 stall, so I am not really worried about going too big.

I think it is all in your combo and tuning. I believe that you can make any cam drivable with proper tuning and a high enough stall.

Chris

 

And a high enough idle .

Or...there is a kit that allows you to run any cam you want (regardless of size) and not have braking problems. here's a pic of it installed in my car:

http://memimage.cardomain.com/member...76_33_full.jpg



Ryan

 

what you have to remember is when you bump up cam size, you're sacrificing power elsewhere. A cam that works well in mid-high RPM is going to lack a bit of low-end torque/hp. That's the flip side of the coin. You want to choose a cam that has a good curve all throughout the powerband. T-REX cams are great for making power, but you're going to KILL low end torque. the larger the cam you go, the higher the gear ratio you'll need, so you may want to take that into consideration. Also, larger cams need more air, so often a tune is needed to correctly set idle speed, or you'll have to start your car up every time you hit a stop-light. lol

 

So will I lose a lot of low end torque with this cam? 222/224 .566 /.568 112LSA

Should I choose one with less lift? or less Duration? And I still don't know how to match the stall convertor to the cam. Now I'm frustrated. Help!

 

You should be alright with that cam. Low-end characteristics will stay the same or improve. best way to match a convertor to a cam is to install the cam and get your car dynod. LOL Find out where your curve really starts climbing, and that's probably where you'll want your stall. That's the easiest way.

 

really you can go as big as you want on stock heads. The Trex cam is ridiculously big but will still do fine on stock heads.

 

Will I have any brake problems with a larger cam? Will I need one of those canisters?