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LS6 style 5.3 heads

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Old 11-11-2005, 03:52 PM
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Default LS6 style 5.3 heads

Any specs found on these yet?

Last edited by Sport Side; 11-11-2005 at 04:01 PM.
Old 11-11-2005, 04:02 PM
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i'm not sure what you mean about this, but the L33 comes with the same heads as the LS6 came with. they have the same part number in the gm parts cataloge.
Old 11-11-2005, 04:04 PM
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Originally Posted by zippy
i'm not sure what you mean about this, but the L33 comes with the same heads as the LS6 came with. they have the same part number in the gm parts cataloge.
Oh, okay... so they just stuck on a ls6 head.
Didn't know, thanks.
Old 11-11-2005, 04:09 PM
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are you talking about the LQ9 heads? they are LS6 heads with bigger chambers for lower ion- in short. but they are for a 6.0
Youd have serious compression issues with them on a 5.3. Too low for boost on stock pistons if I had to guess. proboly the low 8s to high 7s?
Old 11-11-2005, 04:23 PM
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Trey, no. The newer 5.3s have a higher flowing head.
Zippy is saying they are LS6 castings tho...
I had thought, maybe there was a reworked 5.3 head from gm.
Guess not.

Thanks.
Old 11-11-2005, 04:27 PM
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ohh got ya. I thought he might have gotten confused wit the LQ heads.
Old 11-11-2005, 04:33 PM
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yep, they are part number 12564825. they list for the 01-04' LS6 and the L33 engines.
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