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how to tell what year an LS1 engine is?

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Old Mar 3, 2006 | 12:15 PM
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From: El Cajon
Question What year LS1 ?

I purchased a LS1 from a guy, and he does not know what year or type of car it came froom. Is there an easy way to tell what it's out of and year? The alternator is down low. I think that means it's from a camaro.
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Old Mar 3, 2006 | 12:57 PM
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Well, easiest way is probiably off the block. Casting number is on the drivers side of the motor on the back of the motor right below the drivers side cylinder head. Heads could have been changed for XYZ reasons which is why I would use the block if you have a casting number of 12550592 early 98 or 99, or 12559090 it is late 98 early 99. Casting numbers 125555846 is used from 99-00 and some in the 98 motors. Numbers 12559378 is 00-01 LS1 block and 12561168 which is the LS6 block from 01+
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Old Mar 3, 2006 | 01:09 PM
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im pretty sure the alternator is on the bottom side for all LS1's its on the top of LT1's.
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Old Mar 3, 2006 | 03:53 PM
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Look at the valve cover if it has perimeter bolts it is a 97-98 LS1, if it has center bolts it is a 99 or up. If it has an LS6 inatek, it is a good assumtion it is a 2001-2002. ON the LS1 vette the alternator is on top
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Old Mar 6, 2006 | 12:15 PM
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How can you tell if it is a LS6 intake?
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Old Mar 6, 2006 | 06:18 PM
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ls6 intake has no egr provisions
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Old Mar 6, 2006 | 08:36 PM
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Originally Posted by cenTX-LS1
ls6 intake has no egr provisions
Neither do any LS1 vettes, so if its off of a vette pre 01 it still has the LS1 intake, even if it doesnt have the EGR provisions. You can *kind* of tell by looking at it, the LS6 seems to be a little larger, but for sure way it to take it off, it its wavy underneath, meaning not flat, then its an LS1, if its flat LS6 intake. But since yours has the alternator down low, you can tell by what cenTX-LS1 said. Hope that helps!
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Old Mar 7, 2006 | 08:02 PM
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arent the vette altenators on the top as well
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Old Mar 7, 2006 | 09:09 PM
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98-99 had shitty exhaust mainfolds with EGR, 00 had newer exhaust manifolds with EGR, 01-02 had newer exhaust manifolds with no EGR
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