Yes- interesting indeed........................

 

Sorry man, no dyno graph I can give you my impression of the cam if you want. As mentioned, it's slightly different than the off-the shelf cam as it's on a 114 which is what Comp recommended at the time. It also has .520* of exhaust duration as opposed to .522, because that's the way Comp was grinding it 4-5 years ago when I bought and installed it.

It's a very mild cam and a perfect daily driver that sounds almost stock. Noticeable improvement over stock when properly tuned, and it doesn't need a higher stall torque converter, although it would benefit from a mild converter, it's not necessary. When my truck was on 33's at the stock height with bolt on's only, I ran 16.5@81.7 mph, after the cam and tuning, I improved to 15.6@89.5 mph. 60' times stayed about the same, improving from a 2.6 to a 2.4...I attribute this to the 33's. I haven't run the truck with the long tubes and efans, or the 31' tires and lowered stance, so I don't know where I'm at now.

Hope this helps in some way.

 

i called comp a while back to ask them about the xr259, xr265 and the xfi260 xtreme truck cam and was told the xfi260 would be the cam to get because it has less overlap and faster ramp rates,he said that the faster ramp rates bring down the power band, and it would more than likely pass smog, much easier than the 259 would, and it would probably idle like stock. when i asked about the the xfi261 and xfi266 he said i was just splitting hairs and it would only be about a 5hp difference between them. this is just what i was told from a comp cams rep over the phone.

 

Wow, that's crazy. Besides the obvious difference of the .050 duration specs the valve timing events are WAY different. That xfi260 looks like it would be a total turd compared to the 259 or the 265 up top for sure.

 

thats kinda what i thought after looking at the actual cam cards, but he is supposed to know what he is talking about right? i was looking at getting the xr259 but i don't know for sure about it, i like the 265 too, the comp cams tech was pretty insistent on that xfi260, most of the sound clips i have heard the 265 idles smoother than the 259 too , i just dont want to have to swap back to the stock cam every 2 years just to get it smogged another thing that worries me is having vacuum assisted brakes, because more overlap means less vacuum at idle.

 

I installed this Lunati in my 5.3 flex. It woke up the engine big time, but the idle is super smooth, idles at 650RPM with a Blackbear tune. No dyno numbers sorry. Pulls strong from about 2k up to past where my tach ends. 113LSA good for smog check. It was also the lowest priced LS1 cam I could find from Summit, was like $309.00. I am using with LS6 springs. Runs nice, and has low overlap and the intake centerline of 109 matches the 243 head valve size perfectly:



Hydraulic roller. Excellent increase in torque and midrange power! Has exceptionally wide power band with very crisp throttle response. A great replacement cam for the factory LS-6 factory camshaft for those wanting a better performance camshaft.

Advertised Duration (Int/Exh): 262/268
Duration @ .050 (Int/Exh): 212/218
Gross Valve Lift (Int/Exh): .531/.531
LSA/ICL: 113/109
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 1600-6400
Includes: Cam Only

Part Number: 60510

 

All though the 265 is cut on a 114 it also has 2 degrees advance built in. if you look closely it instals on a 112.... also several people have passed smog test here in CA with that cam. CA has some of the most toughest restrictions too. testes are preformed with a sniffer up the tail pipe at Idle, then on a wheel dyno with a load at 15 MPH and then at 25MPH

 

I know it's blurry, I need a scanner. The N/A pull ended just before 6000 rpm.

 

Man I hope I can pass smog with the 265 since I'm installing it in about a week LOL.

 

You should be fine with a good tune, I'm not 100% but a few people on here said a 224/224 is the max for emissions testing.