I have a GM 350, 330 HP H0 engine installed in my 85 Camaro.
The engine pulls good to about 4800 RPM's then seems to run out of steam.
I'm thinking about installing one of the following Comp Cams.

CL12-262-4 = 464/470 lift; 262/270 duration; 114 lobe separation.
CL12-268-4 = 479/480 lift; 268/280 duration; 114 lobe separation.

Current engine setup:

Cam. 435/460 lift; 256/268 duration; 112.5 lobe separation.
64cc Vortec Heads.
Edelbrock RPM Air-Gap Intake
Demon 650 CFM Carb with Vac Sec.
Hedman Headers with 3" Exhaust & Hi-Perf Muffler.
MSD Ignition & Wires.
700R4 Trans with B&M Shifter.
3.42 Final Drive with Powertrac.
16" wheels with 245/50 tires.

Do you all think either one of these cams would improve the top end and still give the power through the lower power ranges that it has now.
Is it worth the Cam change???

 

ok, advertised duration is useless, give us duration at .050" so we can give more useful information.
I'm not sure what cam is in there now...?
The others you've spec'ed are the
xe262 and xe268 both on 114 LSA's.

I think even your xe256 (with the much wider exhaust?) should be able to hit 5500RPM. How are your valve springs? Could use an upgrade?

Personally? I'd do the xe268, but I wouldn't worry about getting it on the 114LSA, 110 works very well. The xe268 and vortec heads (and your intake etc) is a proven combo.

Replace your valve springs, cut your guides down if need be for positive valve stems, and make sure your pushrods are the correct length.

 

The Cam that is in the engine now is the GM Cam that cam in the enginefrom GM.
The Specs are.

GM Hydro Flat Tappet Cam.

.050 duration is 212 degrees Intake and 222 degrees Exhaust.
Lift is .435 Intake and .460 Exhaust.
LSA-112.5

The engine only has about 1500 miles and has the factory stock Valve springs that came in the Crate Engine setup from GM.

I was just wondering if it was worth changing the cam. I want to keep the engine streetable and it does run strong to close 5000 RPM. I thought maybe a little more lift would give a little more top end.
Others around here have said the same as you on the xe268 cam.
Thanks for your response.

 

You'll lose a smidge down low, that's no secret when going up a cam size. But you'll gain a lot of midrange and top end HP, and it should pull like a freight train to 6000RPM.
Your call really. I'd probably check the valve springs, and replace if necessary.

 

what stall are you running? 2500rpm? 2000RPM? with those gears and a 700R4 i would skip all of those cams and move right to the compxe274he and upgrade your springs...

that cam and your setup is pretty streetable you just need to make sure the heads will accept the .510 lift i had to modify mine but i got them from a junk yard i might guess yours have already been done...

but that cam comes alive just above 2k and i mean like 2100 and pulls damn hard right to 6500 peak HP is 382@ 5900 peak tq is 422 @ 4800 and makes 300+ftlbs from 2500-5000rpms well on my setup anyways...

10.2:1 350 vortec 65cc chambers ported and polished by yours truly... cam xe274 , summit stage 3 airgap knockoff and a holley 700DP with long tubes and T-5 and 3.73 gears

its got a lope to it but the stock starter will fire it and it will idle down low i mean 600 if i want normally i keep it up around 850rpms and your low end doesnt suffer all that bad i had 3.08s in it before wasnt a problem at all was my DD

 

Thanks a lot guys for your response. I'm going to take a look at the Comp xe274, but it maybe a little more than I want.
I have a 2000 RPM Saturday night special Torque Convertor.
I'm going to talk to the HotRod Mechanic that I use about the xe274 Cam. I know he said before that anything .500 and over, I would have to rework the springs and rocker studs on the Vortec heads. The same as you guys are saying. Not sure if I want to go there yet.
I may compare the xe268 Comp Cam and the 60102LK Lunati Cam. I've heard both are pretty good street power cams and work well with the Vortec heads.

 

I don't know about reworking your springs...if you can get a good used set of stock LS1 springs or get new ones (beehives), you should be able to get some more rev out of your setup. PAC Racing 1218 or Comp 26918 beehives would work to .600 lift if you ever decide to go bigger.