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heads

This is a discussion on heads within the Internal Engine forums, part of the LSx Technical Help Section category; Are there any advantages to the 5.3 heads over the ls1 heads? I am looking to swap in new heads ...

  1. #1
    Junior Member
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    black
    02 NHRA Firebird

    heads

    Are there any advantages to the 5.3 heads over the ls1 heads? I am looking to swap in new heads on my 02 LS1.

  2. #2
    Member kev70ss's Avatar
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    2000 Camaro ss

    on stock 5.3 heads you will have higher compression, but they dont flow the same as ls1 heads and they have smaller valves. If you get them ported they will be an improvement

  3. #3
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    stock 5.3 and stock LS1 have the same cc volume 200/70 the difference is in the valves. 5.3 heads have smaller valves. Most aftermarket 5.3's have larger valves anyhow. I know my PRC's stage 2.5's have 2.04 intake 1.575 exhaust valves. The 5.3 heads have a smaller combustion chamber at 61cc's raising your compression a little without milling.

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