TQdrivenws6

Hey, I am wondering about a few things and thought that I would post up asking them. First off here are the specs of the cams:

zz409
226/226 @ .050"
Adv. duration 287/287
112 LSA
Max lift with 1.6: .555"/.555"

XE 227/233
227/233 @.050"
I can't find the adv duration on this one.
112 LSA
Max lift with 1.6: .560"/.569"

I am looking to do heads/cam shortly here, and these are the two cams that interest me, as I am shooting for 370rwhp, and want to stay below 6500rpms with descent street manners. I have seen the zz409 cam perform, and it is an awesome performer from everything that I have heard. I know that the zz409 does NOT have symmetrical ramps on the lobes, and I am not sure about the XE grind. I have found a good price on the zz409 cam, which is about equal to the XE227/233 so that is not an issue, so price is not a concern there.

I have personally seen the zz409 cam do 430hp/410tq on the engine dyno, and have not seen many (if any?) results from the XE in question.

I am trying to decide between the two cams listed, and looking for opinions as to which way to go.

Sorry for the length!

Chris

Fastbird93

The flow characteristics of the LT1 head, ported or no, practically demands a dual pattern cam. The lack of exhaust flow is going to require a greated exhaust duration. That said.....

Why not wait and see what your heads flow first and get a cam matched to their potential??

TQdrivenws6

Well, the heads that I am looking at are from TPiS, if I am going to go with the zz409. They claim the following:


Lift .100 .200 .300 .400 .500 .600
CFM 70 145 203 239 260 270
Exhaust flows an avg. of 75.6% of the intake

I have always heard that a .75 ratio is the target to shoot for. So with a single pattern cam, it appears that the TPiS heads would match up quite well....

Chris

simple

yep
after mutch readin up myself about that, it seems that most people decide to go the off the shelf route when it comes to cam selection even with P+P heads
dunno why, from what i've read you can make the same power if not more with a taylored camshaft and not have to spin your bottom end as high as most of the off the shelf grind (306, GM847 etc.)
i would wait and have one spec'd to your setup when you get everything done!

Black_Z28

I have the ZZ409 Cam, and I'm still running stock heads. But I saw a great performance gain. I went from Trapping 106s to trapping 112 with just the ZZ409 cam. I have also seen the ZZ409 cam dyno with TPiS heads. This was at the TPiS shop also. Just a normal 350 with just a ZZ409 and their normal Ported LT1 heads dynoed at 420HP. I have a video of the run too. And a friend of mine has the dyno sheet. I'll try to get a scan of both and post them in the future. Oh yeah, you obviously know Jim, so talk to him about your cam choice. He installed the ZZ409 in my car. Did a great job at it too.

whontime

I am running the 227/233 XE cam with ported heads. My last dyno numbers were 351hp/347tq. The hp numbers are still low, but I am slowly but surely sorting out some problems here and there. The car is too rich at 11.8 across the board which has to be costing me around 15rwhp. Also just today I found out what may be causing me some high rpm problems. My water pump has been leaking on the opti for some time and today it took a crap and dumped all of the coolant on the opti. So here in a few days when I get a new opti, switch to an electric water pump and get the AF ratio right I should see 375-380hp. The 227/233 cam is good for 375 I feel sure, but if you want anymore than that I would recommend a larger cam.

Fastbird93

Not to burst your bubble, but when I was at a 13.0 A/F, I made 375/363. The next time out, after my rich problem had appeared, I was at about a 10.7-11.5 A/F, and was only making 365/355. Down only about 10 HP, across the board. The difference from 11.8 to 13.0 shouldn't be as much as you're estimating. It will be close, but I'd say at BEST no more than your estimate of 15.

TQdrivenws6

Am I correct on this or way off?

whontime

I don't think 15hp is too unreasonable of an estimate, but I may be wrong. Also, my total 375-380hp estimate includes the addition of the electric waterpump and the new opti and coil which should take care of my high rpm cutout/miss.

TQdrivenws6

<---------attempting to get thread back from hi-jackers

My95Z

I don't know much about the other cam but I have the 409. I really like this cam. It is very streetable and extremely fun do drive with (power gains)