has anyone used these lobes before?
lobes are 3404 and 3400.
.006 .05 .200 lift
285 232 147 580
289 236 151 580

112+4

 

It can be done. I talked to Comp about having these lobes ground and they said they could do it on a LS1 journal. It would deffinatlly be something diffrent.

 

anyone else? supposedly these are big in the mustang classes that have to weigh at least 3000 lb and are limited on what lift they can run.

 

I am running these lobes. If you plan on using them you will need to flycut your pistons. They are very aggressive.

 

how do you figure they are less aggressive than the XER lobes. from what i understand duration determines your P/V clearance not the lobe profile. anyone else?

 

Take advertised duration - duration at .050 and you will see these lobes appear even MORE agressive than the LSK lobes! That being said Id expect this cam to make slightly more power than an XER but less than an LSK because the LSK offers a little more lift despite being slightly less agressive than this cheater lobe.

 

i thought the higher the number the less aggressive?

 

The advertised, .05 and .200 only tell part of the story. My cam is 232/236 580/580 113 icl 113 lsa, and I just pulled the heads of to discover that everyone of my pistons had a rather large semicircular divit in them. That's how I figure. Just because the LSK XER lobes have more lift doesn't mean they will make more power. Keep in mind most of the ported stock heads don't flow much more part .600 lift and some actually lose flow. So .580 lift isn't that bad.

 

where your heads milled any? what size valves where you using?

 

Heads were 5.3s w/ 2.02 intake valves milled .01. You might be able to get away with a stock head but from my experience I wouldn't try.

 

Those Cheater lobes are much less aggressive than XE-R lobes or LSK lobes.
Using your example:
.006 .05 .200 lift
285 232 147 580 Cheater lobe
289 236 151 580 Cheater lobe
281 232 153 595 XE-R lobe
285 236 157 602 XE-R lobe
281 231 156 643 LSK lobe
285 235 160 646 LSK lobe

The aggressiveness of a lobe has to do with how fast the lifter gets off the cam base circle and into lift. The rate of lift from .006 to .050" is 53 degrees for Cheater, 49 degrees for XE-R and 50 for the LSK. The XE-R has the most aggressive ramp from .006 to .050", but the power is made after .050"...this is where the LSK lobes spank the other two lobes.

From .050 to .200", the Cheater is 85 degrees, the XE-R is 79 degrees and the LSK is 75 degrees. Basically that means the LSK lobe will give you 10 degrees more duration at .200" than the Cheater lobe with the same duration at .050" and less advertised duration. IMO, the Cheater lobes are weak. If they were the best, you'd see more people running them in LS1s.

 

patrick, do you know of anyone that has tried them? blu, what kind of numbers did you put down and what kind of times where you running? what were your supporting mods?

 

i thought you had plenty of room.
https://ls1tech.com/forums/dynamometer-results-comparisons/451880-01-camaro-h-c-dyno-numbers.html
did you hit on the intake or exhaust?

 

I had no indication of PTV issues until I pulled the heads a couple of weeks ago. I never got any track results due various issues. I had trans problems followed by clutch problems followed by a spun rod bearing. I did notice when I pulled the intake off it appeared that #7 cylinder was not firing. All the intake ports except #7 had carbon deposits lining the port walls. #7 was completely clean. So who knows maybe once I get everything straightened out it will be respectable again.

 

Yep as patrick pointed out I had it backwards.

 

The cheaters a just a bit more harsh than the XE lobes. If someone was wanting something similar to a XE profile, but wanted the extra lift, this would be a good choice.

 

why does it state "race only" in the comp catolog?

 

So maybe the uneducated will buy it!

 

patrick, have you actually seen these lobes in action or are you just speculating?

 

Haven't seen them in action, but based on their specs, I'd say they'd be be between XE and XE-R lobes. Since most people are running XE-R lobes, I'd say it would be taking a step down.