Cman01

Any one doing cams on their LS7 use Comp's line of LSR cams?

They look like they have some serious grinds for the LS7 (also fits other LS engines I believe).

I see and hear a lot of people do Katech cams or some shop recommended cams just wondering why there is little to no use of Comp's LSR series of cams for our engines.

Tony

Cman01

So no one has used a LSR cam in their Z? Shocking!!!!

Unreal

I'm sure many vendors use the same lobes, but I found getting a cam right from comp/crane/etc is really crappy. I had comp spec my first custom cam and it was complete trash. There are so many better people to get a cam from. I wouldn't even considering an off the shelf comp cam.

Cman01

Like Brian Tooley?

For my application IF I pull my heads to get them fixed and do a cam I don't see how Comp can mess me up using one of their LSR cams.

I'm not doing a max effort LS7 build just something better than stock with more power but keeping stock like driveability and mileage. One of their LSR cams should fit the bill for me but I'm open to other cam ideas from others.

MyLS1Hauls

Comp LSR cams use their LSL lobes. There are lots of cams out there in use for the LS7, utilizing LSL lobes. Some off the shelf cams work well...others are less than ideal. I didn't see any LSR cams under "rectangle port heads" that would keep stock like drivability, which is what you say you're looking for. Smallest one I see is a 231/247. Not gonna drive like stock, but it would make pretty good power.

What one did you see that would "fit the bill" for you? You could always call them and see what they recommend, and then report back.

Unreal

Yes, like BTR. Ed C, Pat G, Martin@Tick, Arun, Matt@FSP, Vengance, etc etc etc

Cman01

I saw this vid the other day:


they installed this cam:

http://www.compperformancegroupstore...de=GEN3CamsLSR

I was thinking maybe this one (one step higher than the above cam):

http://www.compperformancegroupstore...de=GEN3CamsLSR

The car in the video is running headers. I DO NOT want to run them so I would like to make the most power/torque with a fixed head and cam swap while staying with the stock exhaust setup and keeping stock like driveability and mileage.

I'm ok to lose a bit of the above to hit my power/torque goals (would like to see 530/550 RWHP after I do the above).

MyLS1Hauls

That 235/251 113 cam has 17*@.050 and 67* at .006, of overlap. It isn't going to drive anywhere close to stock.

Cman01

Remember I'm researching right now. If the higher spec LSR cam I was thinking of doing doesn't work then maybe the cam in the vid could get it done.

Also keep in mind that Comp lists LSR cams for all LS engines. That 285 cam in a LS1,2 or 3 is going to be way wilder than in a LS7 since the extra displacement will help tone down the characteristics of the cam.

MyLS1Hauls

Hey, if you think that 285 cam is going to be fine, then go with it. You asked for advice. I'm giving you this information from my own personal experiences. I've had cams in multiple LS powered engines of various sizes, dating back to 2001. That much overlap with 427ci is still going to be temperamental, won't drive anywhere close to stock, nor get stock mileage. You can't have your cake and eat it too.

Cman01

I appreciate the advice. Again I am in the research phase so as of right now any cam that I may choose is not set in stone. When I get busy and start turning wrenches on my car then I'll figure out what I want out of a cam change and choose accordingly.

Out of all the cams that I've checked out online probably the only one that will get me what I want would be the Katech Torquer (probably the 116 LSA one over the 110) but that cam's been around for years. There's gotta be some advancement in cam design for the LS7 these last few years and is the reason why I'm thinking of other cams.

The cam in that video seem to run pretty decently in that car but I can only go by what the video shows (that cam is a wilder cam than the torquer).

Vito.A

I suspect 530/550 RWHP (without headers) and stock drivability is going to be difficult.

First, understand the OEM LS7 cam specs:
Intake Dur @ .050": 211
Exhaust Dur @ .050": 230
Int lift: .591" (with a 1.8 rocker)
Ex lift: .591" (with a 1.8 rocker)
LSA: 120
The key spec is -20 degrees overlap.


I agree the Torquer 116 is a great street cam, but even it has 20 degrees MORE overlap than OEM, (116 is 0). If you are intolerant of headers, then I'm not sure you'd be happy with a Torquer 116. I'm not disagreeing with you because you are right to be cautious. Many of us make the mistake of selecting too large a cam.


If you really want stock drivability, look for a cam with only slightly more duration, slightly more lift, and slightly more than minus 20 overlap. This may prove to be difficult.


A suggestion is to meet up with other cammed Z06 owners in your area and go for a ride in their car to see if you can live with their drivability.