They were used by GM in FWD applications and are not suitable for traditional engine swaps. Oh, when scouring boneyards for candidates be careful of LS4s. Personally we would suggest pulling the pan and checking the main bearings and doing a thorough inspection of the internals, but that can be your call based on the condition of the engine, the vehicle it came out of, and the mileage on the odometer if can be determined. The price for these engines varies quite a bit, but at our local Pick-A-Part in Southern California we can buy them for around 275 bucks! At that point all you need to do is clean it up and change the oil. LR4 4.8L engines will have flat-top pistons while 5.3L LM7 mills will have slightly dished pistons. With that change came the elimination of the 350. About the only way to know, besides tearing them apart to check the internals, is to use a borescope to look inside at the top of the pistons. In 1999, Chevrolet began phasing out the C/K-series of pickup trucks and bringing in the Silverado pickups. In fact the two engines are identical, so it's pretty much impossible to tell them apart externally. Now the hard part 5.3L and 4.8L Vortec engines use the same block, so both numbers will be cast into the block.
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