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Originally Posted by 76GMC1500
The only good thing about the 6.2L's is that they get great gas milage, 18+ mpg in a 3/4 ton 4x4 Suburban. *There are a few problems I hear about all of the time. *They don't make enough horsepower, only about 120. *They tend to crack pistons, this is a result of injectors dripping fuel on the piston crowns. *If you get the injectors rebuilt every 100k, the engine is usually good for 300k. *Finally, the injector pumps cost a fortune and do wear out. *I would not buy this engine unless it came with a Banks turbo kit. *The Banks kits upped the horsepower to about 190 which is equivalent of a 400 cubic inch gas engine fron the 70's or a late 80's to early 90's 350. *With the banks kits, the engines actually perform quite nicely and get even better milage, 20+mpg. *The final problem with the 6.2's is not the engine, but the transmission. *They come equipped with a 700R4 which is not particularly strong. *It's about the equivalent of the 4L60e found in current half ton trucks from GM. *A military truck may have a Turbo 400 transmission which is one of the strongest transmissions ever put in a light truck
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they came with 155 hp they have 4L80 transmissions and the pumps on the 6.2's will out last the motors. piston's don't crack, it's the heads that crack from heat just don't let them get to hot the 6.2 and 6.5 motors had the same head cracking issues and the 6.2 had the manual injection pumps that last forever not the crappy electronic pumps that the 1994 up 6.5 motors have. The trans on the mil spec trucks all had 4L80 trans which is GM's strongest trans ever that they built for light duty trucks.