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heads and gas

This is a discussion on heads and gas within the External Engine forums, part of the LSx Technical Help Section category; anyone know what heads are best for nitrous or is porting stock ls1 heads good enough i want to go ...

  1. #1
    in doubt tach it out!!
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    BADASSZ28

    heads and gas

    anyone know what heads are best for nitrous or is porting stock ls1 heads good enough i want to go fast!!!!!!!!!!!1

  2. #2
    Senior Member bills98ta's Avatar
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    1998 Trans Am

    I'm running the stock heads and ported the crap out of them ! I also decked them .030" and added the comp cams valve train upgrade. Now I'm working on a set of 5.3 truck heads. Big valves and high compression. They will like the nitrous too !!!

  3. #3
    in doubt tach it out!!
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    BADASSZ28
    aight thanks i have a set of 5.3 heads what is different on them compared to the 5.7 heads thanks

  4. #4
    Senior Member bills98ta's Avatar
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    The stock heads have around 72cc chambers & the 5.3 heads have about 62cc chambers. The ls6 heads are 64cc yeilding 11-1 compression, so the 5.3 will be closer to 11.5-1 !!! They will need bigger valves & ported.( 2.02-1.6 ) The 2.02 valves will fit the existing seats in the heads, just need bored open with the valve job.

  5. #5
    in doubt tach it out!!
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    BADASSZ28
    ok thanks for the info !!!!!!!!!!!!!!!!!

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