The 4.8 and 5.3L came out late 99 in the newer body style TAHOE, 99 in the new style 1500 pickups, and 2000 for the SUBURBAN. The 4.8 and 5.3 are both great engines, and get good fuel milage(probably a good 10-20% better than the last 5.7L engines did with a good bit more HP). I would shoot for one around 02 or so as that was when GM got the HP up, and most of the improvements done to them before they redesigned them in 07.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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