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Schoenfeld makes a nice header for your swap. They're full-length 1 3/4" LTs with a 3" collector and they work with TransDapt's #4572 plates.
Also, if you use the 4.8L truck or CTS-V pilot bearing and a 4.8L clutch/flywheel assembly, your LS1 will bolt right up to the NV3500 5-speed.
Last edited by scatillac; 04-29-2012 at 07:48 PM.