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Re: Fuel efficiency...what MPG do you get?
-383ci stroker (~450hp/475ft lbs)
-M21 4 speed
-3.42 gears, 28" tires
14-15 MPG (50/50 city/highway)
If I were building a truck from the ground up and wanted max fuel efficiency, I'd do a LS1/T56 swap. 
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread
'98 Camaro z28: 370ci twin turbo 370ci build
'01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD
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