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Thread: 2007 5.3L Horsepower?

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  1. #1
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    Question 2007 5.3L Horsepower?

    Anyone know how GM got 35 more horsepower out of the new 5.3L? (285 hp as on my 2002, vs. 320 hp)
    Last edited by olddude; 03-23-2006 at 10:35 PM.

  2. #2
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    Re: 2007 5.3L Horsepower?

    I can't answer you with 100% certainty, but I would imagine that it is just different tuning over the 2006 aluminum 5.3L that many of us (including myself) have which is rated at 310. Just a guess, but that is more than likely what it is. As far as the 5.3L that I have versus the other lower rated ones, I've read many differences. Some internals I believe are different, also a different cam, and higher compression, along with tuning I imagine.

    Nick

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    Re: 2007 5.3L Horsepower?

    The 310 hp L33 5.3 got its 15 hp boost from the iron block 295 hp LM7, from ifferent heads, a small compression ratio bump, slight lift increase via the cam and tuning changes.

    In the new 5.3 I can see GM doing a little more of what they did for the L33 aluminum block L33.
    here is the new engine power lineup from GM.

    L92 6.2 VVT 380-400hp
    L76 6.0 VVT & DOD aluminum block 355 hp
    LY6 6.0 VVT iron block 350hp
    LY5 5.3 2wd DOD&E85 comp. 320 hp, 335 or 340 lb/ft depending on app.
    LC9 5.3 4wd DOD&E85 comp. all alum.310 hp 335 lb/ft
    LY2 4.8 iron block 290 hp

    peace
    Pauly
    Last edited by Pauly; 03-24-2006 at 08:23 AM.
    97 GMC 2wd RCSB 5.7, s10 2700 footstall, Hooker 24621hkr LT's , 2.5" cats dual 4"pipes exit B4 pass. side tire, custom driveshaft 3.42 G80 FIPK MAF descreen GM/Mercruiser Marine intake manifold 29lb LS2(EV6) injectors Ed Wright PCM(best mod), LT4 KM 14.8@94mph 2.007 4000lbs 122mph

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