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Generation III Internal Engine 1997-2006 LS1 | LS6
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243 head differences

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Old 05-26-2015, 10:08 PM
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Default 243 head differences
Looking pickup a set of 243s and get them ported. I know the Z06 243s have the sodium filled lightweight valves. Are all other non Z06 243s the same, no matter what vehicle they came off of?
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Old 05-27-2015, 06:46 AM
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As far as I have seen or read about only the ZO6 and the Cadillac with the LS6 had the light weight valves. All the other 243's are the same.
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Old 05-27-2015, 07:49 AM
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They are the same, although some are called 799 castings but in the end they are no different.
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Old 05-27-2015, 09:12 AM
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I'll be getting the 243s cleaned, ported, etc. Can I get sodium lightweight valves installed while I'm in there? If so, what lightweight valves are recommended?
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