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Thread: 2009 LH8 5.3 only 300hp, take a look at the stock tun

  1. June 3rd, 2009 #1
    Round Rock TJ
    Round Rock TJ is offline
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    Default 2009 LH8 5.3 only 300hp, take a look at the stock tun

    I am trying to find out why the LH8 only has 300hp from GM where the LY5 has like 320. Right off the bat I can see that the timing is not near as aggressive. Is that enough to get the extra 20HP?
    PE seems to be the exact same.
    Airflow seems to be different. I have no idea what that means though. Different cam, intake, manafold???
    I also have no idea how the whole cam phasing thing works either.

    Attached is my tune from my new truck. Only LY5 tune I can find is from a 2007 truck and it is also attached.

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