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1994 K1500 LS3 Swap

This is a discussion on 1994 K1500 LS3 Swap within the General Help forums, part of the LSx Technical Help Section category; Hey guys, new here, I'm 19 and am attempting an engine swap all on my own, I know I should ...

  1. #1
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    Apr 2020
    Yellowknife NWT Canada

    1994 K1500 LS3 Swap

    Hey guys, new here, I'm 19 and am attempting an engine swap all on my own, I know I should probably pay someone to do it but I own a good few trucks and have never put them in the shop for anything and don't wanna start now.

    So I'm putting an ls376/480 in a 94 K1500, my question is what are all the parts ill need for this swap?

    I know I need a new radiator meant for ls engines, a high pressure fuel pump (should i go return style or returnless for the fuel setup?), 1 inch setback mounts, a standalone harness, drive by wire gas pedal, and perhaps a transmission adapter.

    Is there anything else I'm missing? As it's my first time I have no first hand experience with ls engines and all my knowledge about this is from everything I've been obsessively reading online aha,

    Thanks in advance, any and all help would be greatly appreciated!


  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    Feb 2009
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    Navy Blue Metallic
    98 T/A w/ mods, 00 FBVert

    1994 K1500 LS3 Swap

    I take it you mean you have a LS3 and 4L80e transmission?

    You'll need to include new drive shaft and possibly new trans mount, cooling fans plans? IIRC you will need a return fuel system for fuel injection.

    Is this a complete engine and trans combo?

    Accessories included?

    Did it come with ecm and harness? Is the VATs disabled on the ecm?

    Exhaust plans?

    6.0L Block - Forged 403ci , Polluter Stg3 Cam, FAST 102mm Intake, NW102 TB, MSD wires, NGK TR6 plugs, Truck Coil Packs, LS3 Fuel Injectors, CC Pacesetter LT Headers, TS&P ORY, QTP e-Cutout, Magnaflow Muffler, 104mm Air Lid & Line Lock, Catch Can, Stage 2 T56 w/Viper shaft, PRO 5.0 Shifter, Tick MC, SPEC Stg3+ Clutch, QT SFI BH, MWC DSL, Full UMI Performance Suspension, Belstein Shocks, Hotchkis Springs (1" Drop), YR1 Snowflake Wheels wrapped in NT555 tires & Custom Fab Ford 8.8 rear w/Wavetrac Diff 3.73 Yukon Gears, WSQ Hood, 3"CM Strange Eng Drive Shaft.

    00 FB Vert - Stock

    Horsepower never lies, but is often lied about!

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