Is this 5.7L a secret,96/02 G2500/G3500 vans

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b454rat

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Prolly because in those years, 1/2 ton and say light 3/4 were the new body style so would have the LS engine. Whereas heavy 3/4 ton and 1 tons are still OBS. Vans of course. Those are nice cause they have 0411 ECMs already for Vortec/4l80 lol.
 

arrg

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Rick Reid

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this is the motor I put in my 1/2 ton 3 years ago, I love it ! I put a 700R behind it and a Edelbrock 650 Carb/Intake box kit on it !

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L31MaxExpress

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The 1/2 ton's got the 2 bolt mains; the 3/4 and 1 ton's got the 4 bolt mains. That's the only difference.
There is more than that. The 8800+ GVW engines used a better crank, single roller timing chain, hardened exhaust seats, 5qt oil pan, and the exhaust system was drastically different in the vans than the GMT400 1/2 ton based stuff. 3" duals to the muffler with the 454/8.1 cats. The 1-ton setup was rated a little higher in HP and TQ than the 1/2 tons. However 300+ HP is a numbers game. Gross vs Net HP. If you were to pull the engine, strip the accessories off, put headers and a good carb intake and a 650cfm carb on it the thing would make over 300 hp at the crank. That being said, put the 395 marine cam and intake manifold on one with a set of thorley tri-y headers and that same vortec 350 will crank out about 50-60 hp more at the crank than factory, making a true 300 net hp L31 350. On 91 octane mine made 257 hp and 310 tq at the wheels through a 4L85E and GM 9.5" 14-bolt.
 
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