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Hollow/Sodium filled valves?

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Old Jan 6, 2011 | 01:05 AM
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Default Hollow/Sodium filled valves?
Which engines came with the hollow/sodium filled valves? Only the LS6? Or would a vette with the LS2 have them as well?
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Old Jan 6, 2011 | 01:30 AM
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As far as I know it was just the 243 heads that had them.
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Old Jan 6, 2011 | 01:45 AM
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Yeah, but Im pretty sure not all 243 heads have them. Any easy way to identify these valves?
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Old Jan 6, 2011 | 01:47 AM
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yeah if i'm not mistaken it was only the c5z's that had the sodium/hollow valves. i may be brain farting but i can't think of another...


edit: can't remember if the cts-v's had them or not.
Last edited by brian_rs/ss; Jan 6, 2011 at 01:52 AM.
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Old Jan 6, 2011 | 02:08 AM
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pretty sure it was only the C5z's. Ive never heard them mentioned when dealing with the CTSV
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Old Jan 6, 2011 | 04:00 AM
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The ones that generally came on the "LS6" block have them. So yes, the C5Z.
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Old Jan 6, 2011 | 05:51 AM
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The 2005-2006 CTS-Vs with LS6s did come with 243s with the hollow/sodiium-fliled valves.
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Old Jan 6, 2011 | 06:28 AM
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What Darkman said. The 243's obviously came on the LS6 and the LS2 but the only heads to get hollow/sodium filled valves were the ones bolted to the LS6 including the 04-05 CTS-V. The 06-07 had the LS2 and they did not have the hollow/sodium filled valves. So if you find a set off a V, find out for sure what year they came off of. I do not know how to tell the difference just by looking. I have a set of the hollow valves in my garage that are bad. I broke a rod and kissed a piston. Found a whole set on here brand new for less than one valve from the dealer. I can tell you they are ridiculously light.
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Old Jan 6, 2011 | 12:25 PM
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since we're on the topic, anyone care to touch on how much more the sodium valve heads go for compared to the regular 243s? $500'ish?
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Old Jan 6, 2011 | 12:28 PM
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Originally Posted by TA63
Yeah, but Im pretty sure not all 243 heads have them. Any easy way to identify these valves?
im running them and i just weighed them. scale doesn't lie. they are very light, def helps the springs last longer if nothing else.
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