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New Gen 5.3

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Old 12-21-2010, 10:29 AM
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Default New Gen 5.3
Does the new gen 5.3 come with l92 style ports ?
I saw one the other day and it had the 4 bolt throttle body ...

And if it does which heads is it using... can i use those heads on a 5.7 and do a lsa blower ??
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Old 12-21-2010, 10:48 AM
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No, the GM rectangular port heads need a 4.0 bore or bigger.
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Old 12-21-2010, 11:46 AM
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so what type of port do those new 5.3 intakes have

they have those 4 bolt 90mm throttle body openings
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Old 12-21-2010, 12:05 PM
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they have cathedral ports, dont remember the Tb diameter though, a quick google should get you some info on that.
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Old 12-21-2010, 03:48 PM
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Gen IV 5.3 has cathedral ports and uses the 243/799 heads with flat top pistons. TB is 87mm.
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Old 12-22-2010, 08:38 PM
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Originally Posted by Coban
Gen IV 5.3 has cathedral ports and uses the 243/799 heads with flat top pistons. TB is 87mm.
Isn't the 243 the LS6 head? If so, is the 799 really the same thing?
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Old 12-22-2010, 08:47 PM
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Originally Posted by Jimbo1367
Isn't the 243 the LS6 head? If so, is the 799 really the same thing?
yup 799/243=same head
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