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LS1 and LS6

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Old 10-19-2009, 01:27 PM
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Default LS1 and LS6
How can you tell the different between the 2 by looking at it ?
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Old 10-19-2009, 03:40 PM
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Look at the casting numbers on the back of the block.
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Old 10-19-2009, 06:09 PM
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Check the price tag.
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Old 10-19-2009, 09:11 PM
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Heads (243s) will be the only visible (external) difference if the engine is still stock. The later LS1 used the LS6 blocks and intakes; block casting numbers won't help in those cases.
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Old 10-20-2009, 12:08 AM
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Ask it.
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Old 10-20-2009, 07:50 AM
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2001 & up LS1's used the LS6 intakes. The casting number 243, on the front top corners of heads, will indicate an LS6 engine, if original. Casting number 241 indicates an LS1.
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Old 10-20-2009, 05:31 PM
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Sorry guys. I meant intake.
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Old 10-20-2009, 05:55 PM
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ls1 wavy on the bottom, ls6 flat
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Old 10-20-2009, 08:56 PM
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any compare pics

thanks
Lenny
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Old 10-20-2009, 09:56 PM
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LS1 has EGR, LS6 doesn't. Check part #'s..some og the Vette LS1's didn't have EGR and people try to pawn them off as LS6's.
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Old 10-21-2009, 09:47 AM
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The LS6 has the flat bottom like the pic on the left, the pic on the right is the 'humped up' bottom of an LS1 intake.
Attached Thumbnails LS1 and LS6-000083-.jpg   LS1 and LS6-photo1426.jpg  
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Old 10-21-2009, 10:52 AM
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Thanks guys. Now I know what to look for , I got screw from a seller saying it a LS6 intake
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