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Need to know the difference between the 799 and the 243 heads!

   
Old 09-25-2009, 12:53 PM
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Originally Posted by m3srt
i belive i have a 799 on the drivers side and a 243 on the pasengers side
were you the one to post up about it awhile back when you first got your truck? your SN looks fimialar..
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Old 09-25-2009, 06:55 PM
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Only the ls6 243's have the sodium filled valves, the ones that came on the ls2 and 4.8/5.3 and the 799's do not have them. The ls6 ones also came with the yellow springs.
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Old 09-26-2009, 12:53 PM
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Originally Posted by joeyc125
Only the ls6 243's have the sodium filled valves, the ones that came on the ls2 and 4.8/5.3 and the 799's do not have them. The ls6 ones also came with the yellow springs.
Hey thanks man... That helps alot i thought all 243's had sodium filled valves.
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Old 09-29-2009, 02:16 PM
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Originally Posted by LS1FREEK
Hey thanks man... That helps alot i thought all 243's had sodium filled valves.
is this true?
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Old 09-29-2009, 02:33 PM
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not all 243 heads came with sodium valves...only the 243 castings used on LS6 engines came with sodium valves. all of the others use your standard valves.
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Old 09-29-2009, 08:12 PM
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If you take a look here you will find all the answers you need.
https://www.performancetrucks.net/fo...d.php?t=434396
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Old 02-25-2015, 08:18 AM
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I have a 2011 Silverado I have the 243 heads and my uncle has a 2013 Silverado but he has the 799 heads (why and which one are better)
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Old 02-25-2015, 10:11 AM
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I want to say that one was die cast and the other is sand cast. both the same design. I wouldn't say one is better than the other.
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Old 02-25-2015, 12:06 PM
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My 07+ 4.8 has 243 and my brothers 2010 5.3 has 799.
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Old 02-28-2015, 08:14 AM
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Originally Posted by Low_LSX
If you take a look here you will find all the answers you need.
<TECH ONLY> GM Head Casting Info - PerformanceTrucks.net Forums
good info that's for posting that link
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