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Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

Gen iv vs gen iii

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Old 12-14-2010, 12:22 AM
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Default Gen iv vs gen iii
I wanted to know if the Gen IV heads were interchangeable with GENII?
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Old 12-14-2010, 07:41 AM
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Gen3 heads fit on gen4 but chances are your compression is going to be higher. Gen 4 heads will NOT fit Gen 3 because you'll need a 4.0 bore.
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Old 12-14-2010, 08:12 AM
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Originally Posted by litle88
Gen3 heads fit on gen4 but chances are your compression is going to be higher. Gen 4 heads will NOT fit Gen 3 because you'll need a 4.0 bore.
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That's not completely true. Not all Gen IV engines have LS3/LS7 heads. The GEN IV 6.0L and the 5.3/4.8L engines use cathedral port heads and can be used on the LS1/LS6/etc. GEN III shortblocks.
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Old 12-14-2010, 08:39 AM
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also lq4 and lq9 are gen III engines can use gen IV heads because the bore is 4.0"
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Old 12-14-2010, 10:43 AM
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Originally Posted by KCS
That's not completely true. Not all Gen IV engines have LS3/LS7 heads. The GEN IV 6.0L and the 5.3/4.8L engines use cathedral port heads and can be used on the LS1/LS6/etc. GEN III shortblocks.
Aren't cathedral heads gen3? Like I said gen 3 heads will work on gen 4 motors.
6.0 lq9/4 iron blocks gen3 are a 4.0 bore and yes I left that out sorry they can use gen4 heads.
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Old 12-14-2010, 12:00 PM
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Originally Posted by litle88
Aren't cathedral heads gen3?
Not really. Gen IV is typically '05 and up where the reluctor wheel, cam sensor, etc changed. LS2's are considered Gen IV engines, and they utilize cathedral port heads.
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