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While based on the Gen III architecture, GM calls the LS2 (and the variants to come) a Gen IV small-block. This collection of parts represents most of what separates the LS2 from the LS1.
LS2: An Inside Look

 While based on the Gen III architecture, GM calls the LS2 (and the variants to come) a Gen IV small-block. This collection of parts represents most of what separates the LS2 from the LS1.  View Related Article

 

 

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