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Old 06-29-2008, 02:13 PM
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Comp Magnum 280 vs XE274?

Trying to decide between these two cams for my 355 SBC. Currently, I have an Edelbrock Performer RPM, which I've just taken out.

Is there much of a difference between them? I'd expect the XE grind to provide slightly bigger numbers on the dyno, but I'm anxious about the very fast ramps and the strain in puts on the valvetrain.

Car weighs 2,500lbs, has 3.54:1 gears and is a stick shift. Not a daily driver.

Would I benefit from going any bigger on the cam? Currently running stock heads, but will prob either install Edelbrock Performer RPM's (170cc runners), or Holley SysteMAX (184cc runners) heads. Static CR will be ~10.2:1.


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Old 06-29-2008, 02:37 PM
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Well I would go with the XE 274 it would give you better numbers wise and its more of a modern cam technology according to comp cams. The lift is a little more but not too much and lobe separation angle is the same so there would not be .much difference in sound at idle wise and they both would do about the same amount of wear on your valvetrain. I use to have a comp 292 wich is one step bigger then the 280 magnum and it was not bad. With that nice set up you got it would run good I am sure. I also read with recent problems with flat tappit cams going flat that comp said that they have had less xtreme energy cams go flat then the magnum ones so you might want to use that to decide with as well. Good luck I am sure it would do good with either one.
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Old 06-29-2008, 05:08 PM
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Originally Posted by F-BIRD'88
Funny, you never hear of such problems with cam life from people running Isky stuff. My machinist swears by them.
I'm sure isky are great, and I would consider using them. However, the reason you hear of less problems with isky is because far less people use isky. On the other hand you hear so much about comp cams problems is because they are extremely popular cams. The sheer numbers of them out there is way, way more than isky. I'm sure every cam manufacturer has a couple go bad. When you sell 100x more than another company, it'll come up on these forums more often. The relative failure rate is hard to judge and so far I haven't seen any real data.
81 Grand Prix, 355, 700r4, 8.5" 4.10
64 Oldsmobile Jetstar, all original
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