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L33 head camshaft specifications

This is a discussion on L33 head camshaft specifications within the GM Trucks forums, part of the Vehicle Specific category; Does anyone here have specifications on the L33 heads and camshaft? Where does GM pickup 310hp from the 285 hp ...

  1. #1
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    71 Datsun 240Z

    L33 head camshaft specifications

    Does anyone here have specifications on the L33 heads and camshaft? Where does GM pickup 310hp from the 285 hp 5.3?

    Thanks,

    g

  2. #2
    Member Nitrous's Avatar
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    97 GMC with 02 LS6 engine

    The HP comes from the compression ratio, it should be higher on the HO and like dozerdan said the heads are different. I was thinking of something else. I think I have the specs somewhere let me see and I'll get back with you.
    Last edited by Nitrous; 01-18-2008 at 08:55 AM.

  3. #3
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    the L33 has different heads which gives it higher compression, which is where the extra power comes from, and it has an aluminum block

  4. #4
    Member Nitrous's Avatar
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    97 GMC with 02 LS6 engine

    The head numbers are 12564825 which are the LS2 and Z06 heads and the camshaft is 12583623.

    Hope this helps.

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