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Generation III Internal Engine 1997-2006 LS1 | LS6
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determining LS6 heads a friend has for sale?

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Old 11-20-2005, 09:07 AM
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Default determining LS6 heads a friend has for sale?
guys a guy i know has some "LS6" heads for sale . they seem to cheap . i was wondering how i can tell if they are them or just 5.3 or 6.0 heads . sorry i am not that LS1 based experienced yet. any numbers or something on them that woud identify them?
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Old 11-20-2005, 09:15 AM
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casting 243 on lower right hand corner.
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Old 11-20-2005, 09:17 AM
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if they are ls6 heads they will have a casting number on them that says "243"
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Old 11-20-2005, 11:19 AM
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Here ya go...




LS6 is on the left and LS1 is on the right. Look toward the bottom of the combustion chamber.
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Old 11-20-2005, 02:23 PM
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Exactly! The Z06 light-weight valves are very expensive.
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