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I am about to put this on the 383 in my 97 Express van. At just over 11" off the china wall it will barely fit under the engine tunnel, but it will fit. Not overly concerned about low-speed torque loss because I am about to put a 6L90E in the van with a 4.03:1 1st gear and the current converter stalls 2,900 rpm in the 4L85E. I bet the 383 gains 50-60 hp with no other changes. It is currently strangled above 5,000 rpm with the L31 marine manifold and vortec air hat and pulls 2.5 in/hg intake vacuum at 5,500 rpm. For reference, the 383 made 412 hp and 430 tq at the wheels through a 4L85E in 2nd gear and a GM 10.5" corporate full floating 14 bolt spinning a massive clutch fan.
06-10-2023, 09:20 AM
