I have a comp XE262 cam in my 383. It is a tad on the conservative side, will be going up to the XE268 (which I have already laying around).

I like the cams, a little flat down low for my heavy 71 B body, but I do like the driveability.

I would recommed them!

eight

use a 285Hl in my 340, pulls hard to 6800, generally shift 6500. idles at 850 with a 750 mighty demon. in a 340 the 285HL is about as big as i'd go with a street cam.
makes way more power than my old xe268 cam.

The good ones are the roller versions.

Not to stir the pot any, but given all the flat tappet cam failures we hear of on here (and they are A LOT) it boggles the mind why people even bother...

And this is not to say I am any better. I've wiped them too. I'll NEVER use a flat tappet cam again.

Yeah it's expensive to go roller, but chances of having any kind of problem are extremely slim. To me that makes it worth the extra coin. Just my thought on it.

i run the xe-284 in my built 360 demon. excellent cam.
been in that motor for 9 years.
zero problems.
mean nasty sounding cam.
i like it.

BigNozzle has a great point... cam failures have ME more than ready to step up to a roller....once the 509 starts to go.

Like anything else, there's consrvative people and not so conservative. The less conservative one is, the more "perfect" everything else has to be. That means as the rate of lift rises with the mopar design, things like spring pressures, rocker geometry, oil clearances, lifter bore size and angle, lifter rotation... All those things get much more imperative to get right to have no issues. The XE line is a great line of cams. They will be noisey from about the XE268H up. If you want quiet get an older grind and they'll be quiet. I loved Crane for that reason. Biggest killer of these cams is lack of rotation (lifter boores too loose or not angles properly) and too weak a spring (Edelbrocks are just adequate for many of these cams. You can't use ".600 lift" as a spec and think all's hunky dory.)

I'm running the XE294 .519 int .524 exh. This is in a 494 stroker. I'm running a K 5 speed and 3:23 rear gears. This is in a 72 'Cuda. It has ok street manners and is turning 117 mph in the quarter, it has a mean 3rd gear, so overall I'm happy with it. Its been in the car for 10 years. My heads are Muscle Motors bracket iron heads. If and when I change cams I'm going with a roller - I've never wiped a lobe in an engine (lucky I guess). I used to build engines for the circle track racers and proper breakin and attention to detail is vital.

I've got the 275hl in my 451. .525 lift, and idles smoother than my old 383 with the .474 purple cam. Tons of torque. It is noisy, though. You can't really hear it in the car, but under the hood it kinda sounds like a diesel drivetrain. I'm running the crane ductile adjustables on eddy heads...

x2 on the step up to roller

I read enuff on here about flat lobes

I wont use comp cams as they are the ones I have read to much about going flat

I have 3 used rollers now and have swaped all of them at least 2x and not a problem yet

now if I could just make up my mind on which one I want to keep in there

my worthless

Why would these cams be noisy? Aren't they hydraulics?

They are noisey because not all hydraulics are the same. Factory type cams and lifters are quiet. Most older cam gerinds (until they get fairly large) are also quiet because they use stock type lifters. But when the rate of lift goes up (ala Comp's XE line, lunati's VooDoo, some Engle lobe designs, etc) the lifter has to be made differently to handle the spring pressures those fast ramp profiles need. If the lifter preload is perfect, usually they are only slightly noisey. Quieter than a solid flat tappet. If the repload is not perfect, there's not a problem, but they get noisey. Add adjustable rockers and the thin aluminum valve covers and they get rather loud. I like the sound but some guys don't or don't know it's normal.

I thought that the XE series is not a .904 but an .875. That's what the master catalouge said a couple of years back.

The XE "HL" cams are the .904 lifter. The others are based on the .842 lifter's maximum rate of lift. least that's how I understand it.

Well...OK if they are noisy why use them at all?

If a valvetrain is noisy anyway it might as well be a solid lifter.

What does the noise tell you Cap'n? I agree that if you use the wrong spring they will cause problems. But so wil any cam using not enough spring. So MP cams with .028 lash are quiet? Large cams in the 80s with Rhodes lifters were quiet?

We use them because of the power, or more importantly the better range of power, such designs yield. I have a few customers who want things silent. But for most of the people who are running headers and open element air cleaners a little valvetrain noise is just more music. These are not sounding like a 6 vylinder that never had the rockers adjusted in 50 years. They have a slight tick I'd equate to the sound an exh pulse in the header primary has on some cars. It's not bad unless you ignore things like proper pushrod length and preload.