Conversions & Swaps LSX Engines in Non-LSX Vehicles
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1987 gmc

Old 04-06-2015, 10:21 AM
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Default 1987 gmc

Long time lurker… 2 weeks ago I purchased a 87 GMC stepside with power windows, power door locks and the stock 350 engine, currently it runs perfect and the 700r4 isnt bad either. The thing I like about it is there isn’t one thing on it that’s broken (bezels, plastic parts etc) in great condition except for the paint.
In the past 2 weeks I installed a remote start/ door lock unock on it, driver’s window motor. Also purchased a steering column without shifter so I can relockate to a B&M floor shifter.
MOD LIST
3 days after purchasing the truck I bought a complete lm7 from a 01 Silverado, should get here on 4/7/15 once I pick it up ill send the harness off to get it converted.
Bought a oil pan and baffle.
HV oil pump
Water pump
Vette cam, yellow springs front cover, single roller, valve seals from texas speed
GM headgaskets
Flexalite 420 dual 12inch fans
Walbro 255 FP
Holley motor mount plates
Prothane total poly kit
Por15 and engine paint
I know it isn’t everything I need but ill pick up more as I need it. I will hopefully take pics as I go but it always ends up being difficult as I just want to get the job done. Im going with a 4l80e trans, larger posi rear end with 3.42 gear (currently has open diff an 3.08 I think it is. After that stuff is installed ill start the turbo build and get a rear stack on the passenger side step for exhaust. Hope you like it…….








Last edited by army11b; 04-13-2015 at 09:45 PM.
Old 04-06-2015, 10:26 AM
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Let me get my popcorn before you make any more posts!! This is getting good. I love these trucks!! Tasteful, affordable and fully customizable!
I'll be paying attention to this thread.
Old 04-06-2015, 10:57 AM
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Damn, that's a clean truck

I like seeing different aspects of guys doing swaps in square bodies. I'm thrilled I took a plunge into LS stuff, probably never own another carb sbc
Old 04-06-2015, 12:20 PM
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Forgot to post a pic of my son's sweet ride, too bad an ls1 won't fit...
Old 04-06-2015, 12:36 PM
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Clean *** truck dude, looking forward to buidl pics
Old 04-06-2015, 12:54 PM
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Clean truck, i will be following the build!
Old 04-06-2015, 01:15 PM
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Very cool build. I had an 86 4x4 that I loved. Will be a great project. You mentioned an LS1 from a silverado. You are aware that 01 silverado's do not have LS1's in them right? It is an LS based iron block engine with truck intake and accessories.
Old 04-06-2015, 02:47 PM
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Lm..7 right?
Old 04-06-2015, 10:07 PM
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Looks great man! Starting with a very clean truck, I love the old rally wheels
Old 04-07-2015, 09:21 AM
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truck looks great, dont see much for stepsides around much. thought bout installing a stepside bed on my cusom 4 door. I like the phantom grille. ls power where its happening. be awesome truck finished converted.
Old 04-07-2015, 01:23 PM
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thanks, I got the motor today its in the back of the truck ill take a pic when i can... on a side note. I aquired a steering column without the wiper stock on the column, it just has the tilt and blinkers. Can i convert the steering column by stripping the column down and installing the wiper stock/turn signal from my auto steering column, or should i just sell it and look for pone that has wipers/turn signal etc on the column?
Old 04-07-2015, 05:44 PM
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it be easier install using same column. I think 84 was year they started wipers on column. suburban same too.
Old 04-07-2015, 06:27 PM
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Sweet truck dude! I love these old square bodies and have an '89 K5 that I'm gathering parts for a 5.3/4l80e swap. If you haven't already bought the LS6 cam I'd definitely look at some other options. They have pretty mixed reviews from guys with the 5.3 (which I'm assuming is the motor you actually got from the Silverado) since they were made for a larger displacement engine and shift the power too high in the rpm range for most people. Something like the Isky Triple 12 would be a great choice since it's designed for boost but works great in NA trucks also.
Old 04-07-2015, 09:29 PM
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The eagle has landed! Picked it up this morning.....
put on my work shoes



Then tried to find a way to take it out, not hoist atm... oh right in my driveway. Pole, meet ratchet straps



I used the ratchet straps to pull the pallet, motor to the edge of the truck, then backed up on the lower part until the engine stand was about 2 inches off the ground.
now.... my motor on a stand...

Old 04-07-2015, 09:38 PM
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LT1Swap.com has great wiring info. I done 2 truck harnesses now using it. Not to bad to do yourself, I did mine living room floor watching tv. Wire cutters, tape, solder & heat shrink, little torch. Go junkyard get yourself a small underhood fuse box with cover to wire in couple relays,etc. Want help hollor away to me.
Old 04-08-2015, 01:07 PM
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76larkman I used the LT1Swap diagrams as well, made it pretty easy. (also in living room in front of TV)
Looks like its more complicated than it actually is.
Old 04-08-2015, 02:54 PM
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good idea, thanks for the info, havent had to much time today, but i got the ps, alt, bracket, ac/bracket, motor mount and 1 exh mani off. hopefully when the wife gets back ill be able to get everything except heads off of it today...
Old 04-08-2015, 03:32 PM
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hope you dont have any broken exhaust manifold bolts broken in head(common Ls problem). Best way to get out if can is to weld a nut to them & screw them out. you have harder time if that doesnt work.
Old 04-08-2015, 09:22 PM
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Took off some things... 2 broken exhausted mani bolts pretty existibg. 2 broken coils





Old 04-08-2015, 09:49 PM
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Love the truck. Had a 84 in high school that was tubbed with a healthy bbc. One of the few I miss to this day. Subbed.

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