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Even if you could bolt the tiny LS1 throttle body to the LS3 (which you can’t), it would nearly choke it to death. The easy fix was this 90mm billet throttle body from Holley (PN 112-576, $486). Besides being beautiful, it’s a perfect fit for the LS3 intake and will flow plenty of atmosphere. Before installing, we swapped over the TPS and IAC from the LS1 unit to the Holley.