Can anyone tell me what is the max street cam that would work without flycutting if using L92 heads milled to 65cc on an LS2?

 

Define street cam. Wide range of responses dependent on your definition of a street cam.

 

Something that idles reasonably good without shaking or surging and that I can reasonably drive in traffic. From what I understand, I don't have a ton of options beyond fairly mild anyway without flycutting. I have a manual trans. What do you recommend?

 

Hmm. Well, I know there are quite a few people who run the g5x3 cam in their daily drivers, who are making close to 450rwhp, cam only. The cam idles fairly aggresive but is do-able.

I would recommend you look for a cam in the high 220s/low 230s. I wouldn't go to much bigger than that and stay around 600 on the lift and not much more than that. I plan on doing a cam in the coming year. I will be doing a QM custom cam, staying right around these specs. It will make great power and will idle well. But, will not lose any drivability.

 

i'm using the comp cam xer273, i think it was 224/230. .586, 114 lsa, with the L92/L76 combo. runs great, very mild lope, no surge, great power.

 

What kind of valve springs do you have? And are you willing/wanting to upgrade? That makes a big difference in how much cam you can run.

 

What are your numbers? Mainly down low...??

 

The issue with the L92 heads on an LS2 is the chambers are larger, so they must be milled about .030" to maintain compression. I also am a big fan of the Comp Cams XER series cams. You can download the CamQuest cam selection program and plug in the variables and it will give you a wide selection of cams.

Review this article by SpinMonster. He has done several L92 head and cam swaps and has the actual measurements on what will fit.

http://forums.corvetteforum.com/show...ight=l92+heads

 

Thanks for the Link.

I've read it before and its based on the premise that to run a big cam you must Fly cut the pistons, which is something I don't want to do.

 

Hey kaislick,

Do you have any numbers for your set up? Thanks in advance

 

If your concerned about shaking and surging then you probably don't have to worry about how big of cam to use. Anything over 230/575 will shake a little. The idle and drivability is find for a daily driver. I have a 244/615 lift cam in my LS2 without fly cutting the pistons with 12:1 compression. It idles good and i drive it on the street everywhere with pumped gas.
ET 215 Heads, cam, fast intake
Apr 30, 2008
1st pass. 11.042 @ 130.24 mph 1.75 60 ft. 3200 rpm.
2nd pass 1.57 60ft. 4200 rpm, clutch pedal stuck to floor for a couple of seconds shifting to 3rd.
3rd pass clutch pedal stuck to the floor again shifting to 2nd.
I suspect the headers and the friction from the clutch are boiling the clutch fluid.

 

The only person that I feel knows the best answer is SPINMONSTER.
he has done several of these and has tried several cams.
phil

 

Jim
Subject not about Cams but I'm trying to PM back to you but it says that you exeeded your stored private message quota and will not exept messages until you clear some space.
Don

 

A G5X3 will hit a piston if he uses them with heads milled to 65cc's. I dont think that cam would have .080" clearance even unmilled. The L92 heads dont fit big cams.

I would think milled that far, even with a 224 XER, would require serious verification of the P/V distance.

You didnt mention the valves you are using either. If you are using aftermarket vavles (one piece stainless) then the clearance with milling will require flycutting with a 224 XER. The manley raceflo valves for example, have .030" thick margins on the heads of the valves which take close to that much away from P/V clearance. With .025" milled on one application, I had .093" clearance with a stock GM valve. This was with a 228 XER cam. The same set-up with a manley intake valve would be .063"....too close.

Another point to consider is the source you get the cam from. All cams have a variation from the published specs and many can be ground wrong. Cartek verifies all thier cams on a cam doctor and some from their cam source go bakc becuase they are too far from spec. If a cam is supposed to be 224/228 and it comes ground to 225.1/227.2 113.4LSA, its considered to be in spec but wont clear with the same distance as the same cam ground on a different day that came out to be 223.6/227.6 114.2 LSA.

Big cams that fit with stock heads will not mean they fit with L92's milled. In fact they wont.

Lastly, guys making 450-460rwhp with no milling or flycutting have gotten 470rwhp with cams as small as a 224. The TQ of the cam only cars that make in the 435-450rwhp with the X3 do not make more than 385-400rwtq while the L92's with the same 224 cam will get you 40-50rwtq more and much more HP under the curve.

Now mixing the two makes a potent combo. The L92's with fly-cutting will net you near 490rwhp and 440rwtq.

If you take no advice other than this you're doing the minimum: Dont try to design the entire package on your own. Get a tuner involved or go with a proven package.

 

130+ trap speeds are awesome. Change that clutch out and get the 10.7's that are definitely in there. The ETP's and trick flows are awesome heads.

The clutch fluid has nothing to do with the clutch slipping and not being able to handle 500rwhp which your traps speeds indicate you have now. That clutch doesnt hold that much. My LS2 went south in a month when I was at 450rwhp.

This cam would be my recomendation. I ran this cam with 11.4:1 compression but with stock heads.

What compression are you running? What valves are you running? Who diPay the travel costs (shipping on the fly-cut tools too) and a donation to St. Judes and I will fly-cut your pistons for free.

Are you doing the install?d the install?

 

Spin,
I would make a donation to St. Judes just to continue to receive your advice. You are truly a wealth of information.

San

 

Thanks for the compliment.

 

I was planning to do this myself, not to save money but for the fun and challange of it, but now that I'm definitly going to be living in LA for the next few years my plans have changed. I got to figure out the whole California emissions testing thing first to see what I can get away with. At least now I live near some good tuners like Charlie at RPM.


I totally agree with this, donation made.

http://www.stjude.org/stjude/v/index...000e2015acRCRD

 

Bump, I would like to hear more on this

 

the million dollar question.. to FAST or L92/L76!!!!