Gen IV is made differently. While parts swap, the casting is different, such as the placement of the knock sensors(outside of the engine instead of under the Intake on the Gen III), the revised oil gallies, and a few other moddifcations of the Gen III block.
Im surprised that there is a LS2 replacement already. It feels we just got to know you, oh mighty LS2. I think the LS2 is a camshaft away from making it a super engine.
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2/20/2013: They Day the ****s Stopped
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