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Old 11-19-2012, 10:32 AM   #8
Scooby921
Merci Buckets
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Join Date: Jun 2005
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Location: Clarkston
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2011 GMC Sierra
'13 JCW

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Probably better to discuss it in that specific thread, but I think it's technically just a GM small block (Gen 5 variety). I don't know for certain, but I think the LS/LT designation may have more to do with how the engine is built up and spec'd out. Slight difference to a bore or stroke or perhaps a difference in bearing sizes may lead to one version or another, but the general design of the raw block casting is the 5th generation small block.
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