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Lets see your Duration

Discussion in 'The Garage' started by adamforsythe, Jan 23, 2006.

  1. adamforsythe

    adamforsythe 1/2 ton status

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    Post your cam Duration at .050 and tell us what you use your rig for and what it sounds like.
    Thanks
    Adam
     
  2. slowk5

    slowk5 Registered Member

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    I have a lunati 4x4 cam,204 intake and 216 exhaust,in a mild 350.It has really good off idle power,but falls off after 4500 rpm,Thats ok its not a race car.It work for now.Think when i get a 454,ill go for a comp 268
     
  3. BranndonC

    BranndonC 3/4 ton status

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  4. mountainexplorer

    mountainexplorer 1/2 ton status

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    Location:
    Spokane, Wa./Ione, Wa
    Comp High Energy 268 in a 454; 268 advertised duration, 218 @.050, .485 lift. Had a good sound at idle with 3" Flowmasters. Good all around cam. Did notice it didn't have all it's power right off idle but over 1500 it opened up and moved good... did mud and trails with it.
    http://video.google.com/videoplay?docid=3109452006178225322&q=Orange+Blazer

    Comp 280 Magnum in a 396; 280 advertised, 230 @.050, .520 lift. Nice and lopey in the 396 with header dumps open (hard to tell in the video- was putting around in low gear). This motor was in a fullsize Crew Cab on 40s before I swapped it into the Truck Blazer. It liked higher rpms. Not a good towing or low rpm cam. This motor would have screamed in a lighter car.
    http://video.google.com/videoplay?docid=4945735816469301553&q=Mud

    Reground cam similar to Isky 280 specs in a 350. Not sure on the exact specs.
    http://video.google.com/videoplay?docid=-9105210672167082416&q=Blazer
     
  5. theperfectgarage

    theperfectgarage 1/2 ton status

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    comp cam # 12-238-2 duration at .050 = 218/224 in about a 5500lb. k5 / 456 tranny/208 t-case 34 " tires . dd and trails, rocks. Got it runnin thru a pair of flowmasters with a " H " pipe. It sounds flat awesome and when I punch it in third gear at about 35mph and wind her out to about 4800 rpm to grab fourth passengers scream and children on the sidewalk cry and run home.
    I'ts no prob. on the trail cause I'm geard pretty low, Around town I would do better one step up the page, she would pull harder off the line. But it sure sounds bitchen. P.S., the rest of the engine is edelbrock rpm intake w/ edel carb and world s/r torquer heads w/ roller tip rockers and 2.020/1.60 valves.
     
  6. Burt4x4

    Burt4x4 3/4 ton status

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    Location:
    California (Modesto area)
    454
    Comp cam 11-231-3
    Dur @ .05 = intake 210 Exhaust 218
    Lobe lift = .297/.297
    sepration = 111
    (I have a printout)

    Sounds great runs great:D
     
  7. 76zimmer

    76zimmer Flyin Rat Premium Member GMOTM Winner

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    350 comp cams 260.....good torque
    327 crane...238int. @.050 248exh. .490 int, 500exh. in my Vette...runs 12.70 really pulls hard to 7000.
     
  8. lamberthkp

    lamberthkp SITFU Premium Member

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    i run a compcam xtreme energy 4x4cam 12-243-3, avertised duration @ 050 270int./278exh. lift .480/.498. with edelbrock tbi performer intake , summit headers, hooker exh. gotta order a custim chip. it has a purdy big lope, this is still my dd but take offroad as much as possible :D
     
  9. adamforsythe

    adamforsythe 1/2 ton status

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    That is the same cam I am going to put in my 350.

     
  10. lamberthkp

    lamberthkp SITFU Premium Member

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    im very happy with the cam i chose performs how i want it to and sounds awsome. :waytogo:
     
  11. muscle

    muscle 1/2 ton status

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    Location:
    Show Low, AZ
    Chevy 400 sb

    Comp Cams - Duration: @ .050 214/224 Lift .443 .465

    along with 9 1/2 to 1 pistons, balanced, 1.95" intake, 1.75" ex, port & pol.

    low end good, really comes alive at 2100 all through 5000. a little lopey but sounds bitchin at idle and 5000 rpm. :D
     
  12. 55Willy

    55Willy 3/4 ton status

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    comp cam XE-284h-10
    dur @ .50 is .240 - .246
    lift is .507-.510

    it's in a 383 with dart 2 iron eagles 2.02's and just shy of 10 to 1 flat top slugs
     
  13. jaredmajor

    jaredmajor Registered Member

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    comp cams XE-268h
    dur @ .050 218 218
    in a slightly modified 350, nice idle, sounds good
     
  14. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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    At .050:

    Duration
    Intake 204
    Exhaust 214

    Lift at cam
    Intake 280
    Exhaust 295

    Lobe dep deg 112

    Just barely lumpy at idle, great pull from way down low, excellent streetability.
     
  15. trailblazr81

    trailblazr81 1/2 ton status

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    230/236 @ .050 with .490 lift with 1.6 roller rockers. 388 with aluminum heads and 10:1 Comp. The lopey idle with Gear drive is sick sounding at 800RPM. :waytogo: Mixed with the super low sounding exhaust it 1000 RPM and just mean sounding up til 6000 RPM. I have an Edelbrock RPM air gap and BG Speed Demon carb. Its awesome till you get at some bad angles. The motor was originally intended for a 72 Nova, but then got tweaked a little bit and put into the K20.
     
  16. Jagged

    Jagged 1 ton status

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    SWVA
    Comp Cams 270H 224/224 duration at 0.050 and 0.470 lift

    Had a decent lope to it, loved the 1200-4000 rpm range. Pretty good for running through mudholes. Got plenty of comments on it after the cam swap "We thought we heard something bigger tearing through that hole back there."
     
  17. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    When my K25 was still just a 2wd truck, I ran a comp cams XE262-H in it. The specs were 218 224 @.050 .462 .469 lift and 110 LSA. That cam, matched with flat topped pistons, stock smogger heads, stock intake and stock Q-jet, had that engine pulling pretty good from about 1300 up to about 4500 when the stock stuff ran outta breath.

    It had a wicked idle, just enough that you could tell it wasn't stock, but smooth enough that all the vaccum dependant systems still worked properly.

    However, with the 110 LSA, that cam and my TPI don't get along too well, gets what I like to call a phantom lean condition at an idle. Basically, at an idle, the 110 LSA lets fresh air from the intake striaght into the exhaust, which makes the 02 sensor report a non-existant extreme lean condition. Cause the ECM to run full enrichment in an attempt to compensate, which makes the engine run extremely rich at an idle, and idle very poorly.

    So, I plan to take the 262 out, and slap it into my 77 step side later on this spring, and put a comp cams EFI XE256-H in instead.

    Has specs of 212 218 @.050 .449 .456 lift and 112 LSA. It'll probally idle glass smooth, but it is far more appropriately matched to my TPI intake, makes phenominal torque from 1000 rpm to 5000 or so, which is what the TPI is designed for. With the 112 LSA, I shouldn't have any issues with my engine running poorly at an idle, and I'll only need to do very mild prom changes just to make it perfect for my engine.
     
  18. Yukon Jack

    Yukon Jack 1/2 ton status

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    Rose Hill, KS
    My Crane Cam specs for the 454 in my 69 K20 are:

    [​IMG]

    My truck doesn't have a specific use, I use it to haul trailers sometimes, to get to work at least once a week, and it also scares women and young children occasionally.

    Here is what it sounds like from in the cab accelerating.

    http://yukon.b0xen.us/audio/acceleration20.mp3
     
  19. POWERMAD

    POWERMAD 1/2 ton status

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    I went with a Rhoads cam and lifter set.
    440”intake, .460” exhaust.
    Duration at .050” lift is 218 degrees intake, 227 degrees exhaust
    Advertised duration of 293 degrees intake, 306 degrees exhaust
    It has a nice lope to it, with excellant low and mid range power. I can fry the 33"tires even with 3.08 gears.
    Pulls real well all the way to 6500 rpm, I need to get a rev limiter though as it will hit 7K .
    Sounds realy nice with the 40 series Flowmasters and 2.5" pipes.
     
  20. walla2k5

    walla2k5 1/2 ton status

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    Walla Walla, WA
    Used in the mud on trails and even a little snow.Awsome power,nice lopey idle. Magnum 280H.

    http://www.compcams.com/Base/Multihttp://www.compcams.com/Base/MultiMedia/SoundBytes/CompCams280.mp3Media/SoundBytes/CompCams280.mp3



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    [/FONT][FONT=Arial, Helvetica, sans-serif]Grind Number [/FONT][FONT=Arial, Helvetica, sans-serif]CS 280H-10 [/FONT][FONT=Arial, Helvetica, sans-serif]Description[/FONT][FONT=Arial, Helvetica, sans-serif]Intake[/FONT][FONT=Arial, Helvetica, sans-serif]Exhaust[/FONT][FONT=Arial, Helvetica, sans-serif]Valve Adjustment[/FONT][FONT=Arial, Helvetica, sans-serif]0 [/FONT][FONT=Arial, Helvetica, sans-serif]0 [/FONT][FONT=Arial, Helvetica, sans-serif]Gross Valve Lift[/FONT][FONT=Arial, Helvetica, sans-serif]0.48 [/FONT][FONT=Arial, Helvetica, sans-serif]0.48 [/FONT][FONT=Arial, Helvetica, sans-serif]Duration At 0.006 Tappet Lift[/FONT][FONT=Arial, Helvetica, sans-serif]280 [/FONT][FONT=Arial, Helvetica, sans-serif]280 [/FONT][FONT=Arial, Helvetica, sans-serif]Valve Timing At 0.006 [/FONT][FONT=Arial, Helvetica, sans-serif]Open[/FONT][FONT=Arial, Helvetica, sans-serif]Close[/FONT][FONT=Arial, Helvetica, sans-serif]Intake[/FONT][FONT=Arial, Helvetica, sans-serif]34 [/FONT][FONT=Arial, Helvetica, sans-serif]66 [/FONT][FONT=Arial, Helvetica, sans-serif]Exhaust[/FONT][FONT=Arial, Helvetica, sans-serif]74 [/FONT][FONT=Arial, Helvetica, sans-serif]26 [/FONT][FONT=Arial, Helvetica, sans-serif]These Specs Are For The Cam Installed At 106 Intake CL[/FONT][FONT=Arial, Helvetica, sans-serif]Intake[/FONT][FONT=Arial, Helvetica, sans-serif]Exhaust[/FONT][FONT=Arial, Helvetica, sans-serif]Duration At 0.05 [/FONT][FONT=Arial, Helvetica, sans-serif]230 [/FONT][FONT=Arial, Helvetica, sans-serif]230 [/FONT][FONT=Arial, Helvetica, sans-serif]Lobe Lift[/FONT][FONT=Arial, Helvetica, sans-serif]0.32 [/FONT][FONT=Arial, Helvetica, sans-serif]0.32 [/FONT][FONT=Arial, Helvetica, sans-serif]Lobe Separation[/FONT][FONT=Arial, Helvetica, sans-serif]110 [/FONT][FONT=Arial, Helvetica, sans-serif]Recommended Valve Springs[/FONT][FONT=Arial, Helvetica, sans-serif]981-16[/FONT]
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    Last edited: Feb 15, 2006

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