1987 R20 Suburban LQ4 4L80E swap

[MTCK]

Looks great. Where did you get the hood insulation? Mine is hammered and it kind of drags down the look of everything now that it is clean otherwise.

[Nodnarb76]

Originally Posted by MTCK

Looks great. Where did you get the hood insulation? Mine is hammered and it kind of drags down the look of everything now that it is clean otherwise.

Got it from LMC Truck for $40.
Got the clips from Rock Auto for $5
After I got it and opened the box, my cats decided to jump inside the box and play around, inside the box with the insulation. Needles to say it got a little roughed up with my cats.

[Nodnarb76]

The truck was originally a TBI equipped truck, so the hard fuel lines go to just under and behind the firewall. The feed and return lines should only be about 3-4 feet in length each from their to the regulator.

[Nodnarb76]

Got my Radiator back today from Four Seasons Radiator/Racing products.
They did a great job of welding my filler neck back up!

[MTCK]

That's a good looking weld. Also side note but I like the FPR as close to the motor as possible. Less pressure drop when demand increases and long return lines don't hurt anything if properly sized.

[Nodnarb76]

**update**
Funny how life seems to get in the way as soon as you start on a project like this! The last couple weeks, my two days off work have been taken up helping friends move etc...
Found some time yesterday to work on the truck a little. I got my stainless steel flexible upper radiator hose, my air intake tube, and my fuel/trans cooler lines measured and ready for cutting. After these things are cut to length, should be able to start it!
One thing I have run into, my air intake (Spectre cold air intake) puts the air filter right where my battery sits. Instead of relocating the battery, am going to cut about 5" off the intake tube/pipe. I am worried the filter is so big it may not fit when the hood is closed and my rub my new a/c compressor. If all else fails, could I just install a filter directly onto my throttle body and mount the mass air flow sensor between the filter and throttle body?

[Nodnarb76]

Got it running today!
http://youtu.be/NFSklMgVUdQ
Still have to adjust the shift linkage and install my fan controller and it should be ready to drive soon.

[MTCK]

Congrats it sounds great. Is your tach showing 2x the rpm? I think I recall Larry had to set his tach to 4 cylinder mode when he did his 8.1 swap. Maybe not it just didn't sound like you were reving to 5k. Nice work.

[72MARIO]

Nice to see it running Cant wait to hear how it compares to the old big block. I noticed the tach seamed really high also

[COS399]

Looks and sounds great. The new gauges look right at home in there.

[Nodnarb76]

Thanks guys, has been a long and expensive road, and I'm almost there. Couldn't have done it without the help of everyone on here, thanks again! Will post some more pics/videos once I have a little more to show off.
As far as the Tach, May have accidently set it to 8cyl mode instead of 4cyl mode like I'm supposed to. Sounds like an easy fix.

[Nodnarb76]

Well it's done!
Took it out today for the first time in 5 months and filled it up.
Runs and drives perfect!
Now just have to make the motor look pretty and hook up AC.

[Nodnarb76]

Managed to get the new engine covers on today.
Keep getting a CEL codes P0171 & p0174. I can reset them by disconnecting the battery but under hard acceleration it comes back on. Hear this may be because I have e MAF mounted to the throttle body. Going to move the filter and MAF further away to see ifs if it helps, parts should be here next week.

[Nodnarb76]

Cut a small hole for the fuel pressure gauge.

[COS399]

Looks great. Good Job.

[MTCK]

Nice work that looks awesome. What are those codes?

[Nodnarb76]

Originally Posted by MTCK

Nice work that looks awesome. What are those codes?

Keep getting p0171 & p0174, too lean on banks 1 & 2.

Thanks for the kind words!

[Marshy]

Nice work. What are you getting for fuel mileage now? Did you move your filter and get the codes figured out?

[Nodnarb76]

Originally Posted by Marshy

Nice work. What are you getting for fuel mileage now? Did you move your filter and get the codes figured out?

Thank you, I'm getting around 14mpg (mostly highway driving). I have clocked about 2000 miles on my tuck since the swap and everything seems to be going fine with no problems. I moved the fuel filter/Regulator down a little bit on my firewall with no issues. I did get the CK engine light figured out, turns out the people that did my exhaust left the bolts loose that connect the exhaust to the manifolds and that allowed air to get into the exhaust and past the o2 sensors creating a lean code.

Here is a recent pic of the motor after everything was done.

[Marshy]

Very nice. I want to build a 6L myself even though I don't have anything to put it into besides my K10 right now.

How is the power?

[OutlawDrifter]

Just read through your thread. Very nice setup! I would live to have an LS swapped 3/4t burb. Lice the two tone combo also!

[Nodnarb76]

Originally Posted by OutlawDrifter

Just read through your thread. Very nice setup! I would live to have an LS swapped 3/4t burb. Lice the two tone combo also!

Thank you for the kind words!
it was a lot of work and a lot of money, but in the end it was definitely worth it.

[l92powered77]

Wow really nice burb.who tuned the ecm? I have the p0171 ans p0174 and cant get rid of them either. Bolts are tight. I need a serious retune i only have a stock tune from psi conversion. Who did your tuning? You have hgen 3 you can send it quick anywhere to want without having to take out tcm like ua hen 4 guys. Sounds good i have same mufflers on a 6.2. Did you end up shaving tabs off tranny for manifolds? I had to switch to ls3 manifolds. nice build! Do you tow anything?

[Nodnarb76]

I found an exhaust leak at the manifolds where they meet the exhaust. Got that taken care of and codes haven't come back. I would recommend running some seafoam through your motor, and see if you see any smoke/leaks.
My ECU came already tuned with my harness/motor from LSX4U.com. Good people to work with.
I did have to cut the tabs off the transmission with a sawsall for the exhaust to clear.
I don't tow anything but if I wanted to, I feel I could with no problem.
Good luck on your build, I hope you get those codes figured out.

[MTCK]

Truck looks great. Have you been driving the wheels off of it? How's the performance and economy been?