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cam help

This is a discussion on cam help within the Internal Engine forums, part of the LSx Technical Help Section category; The xr265hr from the web site (the one I was thinking about using) Camshaft Specification Table Part Number 54-412-11 Engine ...

  1. #21
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    Indigo Blue
    2000 ext. cab Silverado

    The xr265hr from the web site (the one I was thinking about using)

    Camshaft Specification Table
    Part Number 54-412-11
    Engine 1997-2006 General Motors
    350ci,
    Gen III/LS1/LS6,
    8cyl.
    Grind Number LS1 XR265HR-14 Description
    Intake Exhaust
    Valve Adjustment 0 0
    Gross Valve Lift 0.522 0.529
    Duration At 0.006 Tappet Lift 265 271
    Valve Timing At 0.006
    Open Close
    Intake 21 64
    Exhaust 72 19
    These Specs Are For The Cam Installed At 112 Intake CL
    Intake Exhaust
    Duration At 0.05 212 218
    Lobe Lift 0.307 0.311
    Lobe Separation 114
    Recommended Valve Springs 941-16

    The others i am not sure

  2. #22
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    Indigo Blue
    2000 ext. cab Silverado

    Camshaft Specification Table
    Part Number 54-426-11
    Engine 1997-2006 General Motors
    350ci,
    Gen III/LS1/LS6,
    8cyl.
    Grind Number XR275HR
    Description

    --------------------------------------------------------------------------------

    Intake Exhaust
    Valve Adjustment 1 1
    Gross Valve Lift 0.566 0.568
    Duration At 0.006 Tappet Lift 275 277

    --------------------------------------------------------------------------------

    Valve Timing At 0.006
    Open Close
    Intake 28 68
    Exhaust 73 25

    --------------------------------------------------------------------------------

    These Specs Are For The Cam Installed At 110 Intake CL
    Intake Exhaust
    Duration At 0.05 222 224
    Lobe Lift 0.333 0.334
    Lobe Separation 112

    --------------------------------------------------------------------------------

    Recommended Valve Springs 26918-16

    http://www.compcams.com/Technical/Se...mber=54-426-11

  3. #23
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    Indigo Blue
    2000 ext. cab Silverado

    in the mag i have it says
    XER281HR
    valve lift 0.595/0.598-inch intake/exhaust
    duration at 0.050 232* intake/234*exhaust
    lobe displacement angle 112*

  4. #24
    Senior Member ninobrn99's Avatar
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    all bore 370 Trans Am

    those arent bad cams. very mild and tame..should be easy to tune.

  5. #25
    Senior Member ninobrn99's Avatar
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    Quote Originally Posted by BB540
    in the mag i have it says
    XER281HR
    valve lift 0.595/0.598-inch intake/exhaust
    duration at 0.050 232* intake/234*exhaust
    lobe displacement angle 112*
    Thats a big cam. It wont pass smog. Im running a 230/232 112+2(110 icl)

  6. #26
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    Indigo Blue
    2000 ext. cab Silverado

    Quote Originally Posted by ninobrn99
    I dont know of any software that does that..im sure there is, but I dont know what it is. The truck manifold again, will help keep your lowend torque, but the sacrifice there is you lose some top end performance and your rpm range is limited. I dont think an aftermarket set of heads will hurt you. With the right size chambers and milling them a bit along with a slightly thinner gasket you will gain static compression. Along with that you will raise your Dynamic compression which helps keep your under the curve power. You'll gain more with your setup with better flowing heads. Sticking with a set of p/p 5.3 heads is the way to go I think. If you were going to tune it yourself, Id say to expeirment. Keep the stock intake for a bit and see how you like the power. Change over to the ls6 and see how you like the power from that. Whichever you like the most, stick with it.
    Ok I found what I thought I believe i had previously read. An I must correct my self. You are correct about the low end tourqe What I read in particular about the truck manifold was on page 82 in the July 04 issue of CHP Now I am not sure if there are diffrent truck manifolds but the one used was From a 6.0 part number 25328620 and the engine used for testing the 5 manifolds was a 6.o

    also tested were the LS1, the LS6, the LSX, and the Weiand/Lingenfelter

    stock 6.0 crate engine with 10.25:1 comperision
    2.00-inch intake/1.55-inch exhaust factory heads
    denso plugs IT-22
    hooker super comp long tube headers for f-body
    Stock cam at
    0.500-inch lift, 200/203degrees duration at 0.050
    1.7:1 Roller rockers

    test 1 -LS1
    419hp@4700rpm
    416tq@5800rpm

    test 2 -ls6
    425.5hp@4700rpm
    421tq@5700rpm

    test 3 - 6.0 Truck manifold
    427.9hp@4700rpm
    419tq@5900 rpm

    test 4 - FAST LSX
    426.2hp@4800rpm
    427tq@5900rpm

    Test 5 - Weiand/Lingenfelter
    411.2hp@4800rpm
    408.6tq@6000rpm


    Cant find it on their website but if you have the issue you should look it over to see what i mean about the manifold comparison in this particular test.

    I found 2 programs for computer dyno tuning but am not sure how good eiter one is. one is from www.compcams.com the other is from www.proracingsim.com .

  7. #27
    Senior Member ninobrn99's Avatar
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    FWIW, Im about to have a 6.0 block. Im upgrading to a 370 over my 346 It wont go in until august so I wont have any numbers till then. While those number are great, the peak hp is what I dont like. 4700rpms?? Does it die off after that? I dont have that issue, so I cant reference it.

  8. #28
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    Indigo Blue
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    Remember they are using a stock 6.0 Cam and those numbers are on an engine dyno not at the wheels. Yes the HP starts to taper back down after 4700rpm

  9. #29
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    Indigo Blue
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    Were are you located? do you have the 6.0 yet? were did or are you going to get it from?

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