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LS2 heads on LS1 block?

This is a discussion on LS2 heads on LS1 block? within the Internal Engine forums, part of the LSx Technical Help Section category; so i came across a pretty good deal on a set of LS2 heads. now from what i've read the ...

  1. #1
    Junior Member krazykarl454's Avatar
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    LS2 heads on LS1 block?

    so i came across a pretty good deal on a set of LS2 heads. now from what i've read the ls2 heads pretty much have the same specs as LS6. (i think) plus it has a higher comp. ratio then the LS6 heads when running flat tops. i think around 10.9:1 instead of 10.5:1. so my question is?.... why are people running these heads on ls1 blocks? is there sumthing im missing? a reason they WON'T work? well thank for any info u can get me.

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    Veteran 0rion's Avatar
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    ls2's use 243 heads which are ls6 heads. They'll flow better than ls1 heads but I would recommend getting them ported and polished.

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    Junior Member krazykarl454's Avatar
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    ahhh.... i c so would the higher comp. ratio be true to them on a ls1?

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    Firebird Encyclopedia 9T8W66's Avatar
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    Yes they have smaller combustion chamber therefore you will see an increase in compression ratio. LS2 243's are identical to the LS6 casting except that they do not use the light weight valves.
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    Veteran 0rion's Avatar
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    ls1 heads are 10.1:1 and ls6 heads are like 10.4 or 10.5:1...... I forget which.

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