Comp Cams XE268 cam - Team Camaro Tech
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post #1 of 11 (permalink) Old Aug 30th, 08, 06:49 AM Thread Starter
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Comp Cams XE268 cam

I am thinking about buying a comp cam XE268 cam for my mild 350. If anyone has any experience with this cam or is running one now I would really appreicate any info on how it has worked out for you or the combination that you have used with this cam. Thanks
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post #2 of 11 (permalink) Old Aug 30th, 08, 07:27 AM
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Joe A
 
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Re: Comp Cams XE268 cam

I am running that cam on my 355 with 461 heads...Holley 600 carb and I like it a lot. If you take a look at my Photobucket page you can see a vid of it after break-in. Actually my hole top end valve train is Comp Cams.

Just so you know if you do a search on this cam you will find a lot of posts of lobe failure due to one reason or another. I followed the cam install guide to the letter...put in the correct valve springs...using roller rockers I set my valve lash to 0...Then using the Rotella oil with a bottle of E.O.S. I has no issues after the break-in...NO LOBE FAILURES.

My set-up is for a street application with a 4 speed and 3.55 gears and I do like the throttle response thus far and still pull enough vac for P/S and P/B so if you plan on building a moderate street engine I would say a 477 lift cam is right for the 350 using stock heads.

Jut my .02

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post #3 of 11 (permalink) Old Aug 30th, 08, 03:40 PM
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Greg
 
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Re: Comp Cams XE268 cam

I ran that cam in a 350 with E rpm heads.
At 140000 miles it ran a 14.3 94 mph and 9 cupped lifters before I tore it apart,great Cam and I got my moneys worth
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post #4 of 11 (permalink) Old Aug 30th, 08, 05:22 PM
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Andy
 
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Re: Comp Cams XE268 cam

My uncle has that cam in his 350 Nova along with vortec heads, performer intake and a 670 holley vacuum secondary carb and it is a great combination. It makes a ton of mid range torque with the vortecs. Perfect for a high performance daily driver.

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags
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post #5 of 11 (permalink) Old Aug 30th, 08, 06:17 PM
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Smile Re: Comp Cams XE268 cam

No experience whatsoever w/ it, but imho, I'd either run the tried and true old 268HE or Crane's 272/272 Energizer OR step up to UDHarold's VooDoo 268.

Too many people have commented on the XE cams being noisy and I just have to think that it's b/c they are too aggressive on the closing sides of the lobes and to me, again, imho, that's not all that good for longevity.

And I have ran the 272/272 Energizer in my old 327 engine and it ran like a "scalded-dog"!!

yellow heap,

that was 140,000 miles, right? Wow, you proved me wrong right there, but I wonder how many other guys have had your success?

And as always, jmho.

pdq67
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post #6 of 11 (permalink) Old Aug 30th, 08, 09:07 PM
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Greg
 
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Re: Comp Cams XE268 cam

yes 140,000
I had a no disaster break in and after 1500 miles it was Mobil 1 all the way
At the end it was trashed though
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post #7 of 11 (permalink) Old Aug 31st, 08, 12:02 AM
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Darko
 
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Re: Comp Cams XE268 cam

i had a 274 in my mild 350 longblock with a 671 blower...this is what it sounded like before i blew the motor....it had very little lope


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post #8 of 11 (permalink) Old Aug 31st, 08, 12:08 AM
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Andy
 
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Re: Comp Cams XE268 cam

I have rode in/drove cars with the XE268, XE274 and XE284 hydraulic flat tappet cams and have yet to hear the "excessive" valvetrain noise people complain about. Now, LS based engines with big hydraulic rollers make some valvetrain noise for sure. My friends old 03 Z06 Vette with a 240/244 .605/.596 112 LSA "Vindicator" cam. http://media.photobucket.com/video/s...ics343.flv?o=3 The problem with the lobes going flat is people not using the right kind of oil, and the lifter bores in the block. I'm putting a XE284 in my 406 and the machinist said that it was critical that I true up the lifter bores because of the ramp rates on the cams. He said that of all the sbc engines he's done, he has never had a problem with an xtreme energy cam if these two rules were followed.

XE 268 sound clip from my uncle's nova
http://people.clemson.edu/~jaander/v...y%20II%202.wav

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags
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post #9 of 11 (permalink) Old Aug 31st, 08, 05:27 AM
brian
 
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Re: Comp Cams XE268 cam

i am using that same cam now.355w/ flat tops,993 heads, rpm air gap intake with 650 double pumper.i love that cam. it makes great power through the power band.it was the best cam for my set up.you got to know what springs you already have on your heads. i don't think you can run your stock springs with this cam. comp told me this. they do advise you to change the spring to ones that can handle that lift of the cam.if you don't,that will wipe lobes off the cam!!! i had the cam for 12000 miles. i have no problem with it at all.if you run a set of roller tip roker arm,you will get some valve chatter. i will clearly say this is the best cam i have ever used and would refer it to any body.
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post #10 of 11 (permalink) Old Aug 31st, 08, 10:46 AM
Shelly
 
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Re: Comp Cams XE268 cam

I have this cam in my car also. It's a 350 small block with stock smog(336X) heads milled to 70cc and stock GM Z28 valve springs. With flat tops it is a little over 9 to 1 compression and we run a 750 vaccum secondary carb. This is my second season bracket racing with close to 200 passes, and the last two seasons we have put approximately 7,000 street miles on this combo. Note- this was a previously used cam. This year my new personal best is 12.84 @ 102 m.p.h. The car does have a 3500 stall, which does give good 60'- my best is 1.64 and still works reasonably well on the street. We've had no issues with lobe failure and run old formula Rotella. We do not find the cam louder than any other hydraullic cam with roller tip rockers. For a mild combo I feel its a great cam.

http://www.new.facebook.com/photo.ph...0&id=799422225

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post #11 of 11 (permalink) Old Sep 1st, 08, 08:28 AM
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Re: Comp Cams XE268 cam

Here's some info on my old engine. A newer set of good aftermarket heads would make even better power.

http://www.classictrucks.com/tech/cl...tor/index.html
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