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90 K5 LQ4/4L80E

Simple LS swap using junkyard and second hand parts

Eric9690

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Eric9690 submitted a new Build:

90 K5 LQ4/4L80E

Picked this truck up from a buddy who needed some money after buying his first house. Has a rebuilt title and a knocking engine. Also needs a little bit of body work but overall rust free considering it had spent it's entire life in Missouri and Illinois. Interior is pretty mint too aside from a couple holes drilled in the lower dash and the upper dash pad destroyed from the sun. The plans have changed quite a bit since I got it. Originally was going to put an 8.1 in it that I've had in my garage for a while. Then due to the 8.1 needing a crank, was going to slap a crank kit in the 350 and drive it while repairing the 8.1. However after a weekend of craigslisting, found a 6.0 and some 4l80e's nearby that I went and picked up. Ended up getting a 100% complete LQ4 harness, ecm, all accessories for 700. Drive 30 minutes west and bought two 2WD 4L80's and a 4WD 4L80 for 400 each. They all smell a little burnt so hopefully just some new clutches and bands and some trango kits and we will be all good.

Read more about this build here...
 

Eric9690

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Trying to figure out this forum's format so sorry if I get confusing here. Some more pictures so far of the truck and parts gathered so far below. The engine and trans will be mostly factory, save for a tune and a transgo shift kit for the 80. Plan on using the factory manifolds that came with the engine and if needing to, cut off the factory flanges to position it to clear the frame. Will be keeping the ac lines intact and using a Holley ac bracket for an R4 for the LS engines. Mounts will be dirty dingo sliders and I'll be moving the trans crossmember back and having the driveshafts cut/lengthened as needed. Also plan on moving the battery to the driver side, mounting the battery tray and airbox trays from a donor 99-06 Silverado, to use the airbox from the same truck as well as the coolant reservoir. Due to the reservoir being pressurized, will be using a sealed radiator again from a 99-06 truck with an electric fan from the same truck. Will be using the factory harness cut down, with a underhood fuse block from the donor truck and will wire the relays for the new electric fans into the block.

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CK5

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Nice, I'm leaning toward a 6.0 and 4L80 myself.
 

Eric9690

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I have an LQ4 in my 79' Malibu with a set of 243 heads, cam, intake and the car hauls ass. Super fun to drive. Gas mileage sucks compared to a 4.8 or 5.3, but it's worth it.

Tore down the outside of the newest 6.0 to my collection and test fitted some combinations. I like using the factory gm low mount compressor, however I've seen fitment issues with these frames. Also, the dirty dingo sliders hit the low mount compressor bracket and would not allow the engine to slide back more than an inch, which is the whole point of the slider mounts.

So what I found worked best, is the Holley passenger side high mount bracket for an R4 compressor. Luckily the benefit of having 6 project cars is having parts that basically fit anything. So i have the bracket and compressor upstairs and the next thing you know, fits great.

I wanted to use the factory air duct inlet from a 99-07 Silverado, however the duct hit the compressor bracket. My daily is a 07' Silverado Classic, and a couple years ago I removed the factory air cleaner inlet tube to replace it with a nice looking Airaid inlet tube, that uses the factory airbox and a drop in K&N filter. So i robbed the tube from my truck and did a quick test fit. Works great and should fit pretty well in the K5.

Havent gotten the old drivetrain out yet, as I'm doing an engine swap in an Astro van in the middle of my garage. 3 cars torn apart at once is enough.

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NorCalAnthony

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Any updates on your truck? I've been gathering parts to do something similar for a while now and wanted to see how the newer radiator, fans, and coolant overflow all worked out for you.
 
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