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LS3 and LS7 Head question

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Old Feb 23, 2011 | 09:56 AM
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Default LS3 and LS7 Head question

I did search.

Aside from the bore limitation on the LS7 are the two heads the same?
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Old Feb 23, 2011 | 10:28 AM
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They are, aside from the bore limitations, still quite a bit different. The LS7's come equipped with larger valves (titanium on intake) than the LS3's do. They also come with 1.8:1 rocker ratio which use an offset intake (different offset than the LS3's). They require different/specific intake manifolds as well.

That's a few of the high points, but they really are quite different!
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Old Feb 23, 2011 | 03:29 PM
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Do they both use the same port shape?
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Old Feb 23, 2011 | 05:13 PM
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Originally Posted by ponjohn
Do they both use the same port shape?
intake port? shape.. yeah same "shape" but different size.
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Old Feb 23, 2011 | 05:40 PM
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Originally Posted by ponjohn
Do they both use the same port shape?
Similar shape, different size as stated in the post above me
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Old Feb 24, 2011 | 07:48 AM
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Great info...tx.
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Old Feb 24, 2011 | 11:23 AM
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That chart is perfect! LSXr come in both sizes?
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Old Feb 24, 2011 | 11:26 AM
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Originally Posted by Gordon0652
That chart is perfect! LSXr come in both sizes?
Yes LSXR intakes comes in LS3, LS7 and LS1 configurations. A total of 3 different LSXR intakes not counting the LSXR truck intakes.
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Let's say that you have a set of ported LS3 head and a set of ported LS7 heads that flow about the same. Will one make more power than the other with everything else (except the respective correct intake) being the same?
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Old Feb 25, 2011 | 02:02 PM
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If they flow equal I'd still say LS7 has the advantage due to the better valve angle.
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