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You'll have real problems running the LS2 engine if it does not have the correct reluctor on the crankshaft. You may have to get an LS1/LS6/5.3/6.0 crankshaft installed in the engine for it to communicate with your older PCM. You will also need extensions for the camshaft sensor(its on the front timing cover instead of in the back of the block) and for the knock sensors ( they are on the driver side of the block near the oil pan). You'll also have to take your knock sensors off your old engine and mount them in place of the LS2 units. That will require you having the holes drilled and tapped for the older style knock sensors. Beyond that you will have to install your oil pan and oil pick up tube, intake and exhaust manifolds and get the PCM reprogrammed to handle the larger cubic inches. You'll most likely need bigger fuel injectors but I could be wrong on that one.
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well thanx for the info, hopefully they know all that stuff. they have put an LS6 and a t-56 in an 03 silverado, so maybe they know everything to do, i sure hope they do they do shit like that for a living. thanx again for the feed back