My 2003 Yukon build

[franky996]

So the engine in my '03 Yukon XL decided to crap out on me last summer and I have been gathering parts and building it up since then. The whole process was pro longed due to the pandemic and parts being on back order etc

At first I just wanted to put a rebuilt LQ4 in it that I had sitting in my shop. The engine was a short block. But then of course you start to think and it all goes downhill from there

Ordered some Texas Speed and Performance heads and cam shaft , push rods, double roller timing chain set and a GM High Performance oil pump
The heads are the PRC 220cc-15 degree heads, .660" Dual Spring Kit with Titanium retainers , 61cc
Camshaft is a TSP 224/228 .600"/.600" 112

Intake manifold is a Holley High Rise EFI intake with my own carbon top and a Nick Williams 103mm throttle body and 42lbs injectors

Headers are Speed Engineering long tube headers that I coated with ZyCoat heat coating

The headers are attached to the heads with Stage8 locking fasteners

Transmission is a Monster Transmission 4l65E
SS Mega Monster rated at 650hp/600TQ , Thor torque converter 1800-2000 stall with lock up, billet oil pan with drain plug

The rear end was rebuilt, new ring and pinion gears, bearings etc and a Yukon gear limited slip. Powerstop disc and pads

 

[franky996]

I also got the electric fans and harness kit.

Most of the work is now done. What's left is making some fuel lines to put the fuel pressure regulator in line and mount it somewhere convenient. And the vacuum lines and wire harness from the old intake need to be made look pretty and re routed a bit. If anyone has done the Holley EFI intake and has some pictures of how they did it that would be helpful.

Really excited to fire this thing up for the first time. Then get it tuned

 

[Tonyrodz]

I also got the electric fans and harness kit.

Most of the work is now done. What's left is making some fuel lines to put the fuel pressure regulator in line and mount it somewhere convenient. And the vacuum lines and wire harness from the old intake need to be made look pretty and re routed a bit. If anyone has done the Holley EFI intake and has some pictures of how they did it that would be helpful.

Really excited to fire this thing up for the first time. Then get it tuned

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Def gotta get a video of the start up and it running.

 

[corvette744]

I also got the electric fans and harness kit.

Most of the work is now done. What's left is making some fuel lines to put the fuel pressure regulator in line and mount it somewhere convenient. And the vacuum lines and wire harness from the old intake need to be made look pretty and re routed a bit. If anyone has done the Holley EFI intake and has some pictures of how they did it that would be helpful.

Really excited to fire this thing up for the first time. Then get it tuned

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Dam that is one nice looking setup.

 

[Rocket Man]

Can’t wait! Sweet build.

 

[Joseph Garcia]

Outstanding!

 

[fasteddy]

OMG
That's intense!
Nice lid for that high ram.
Very nice heads.
Lots of Gen3 HHR installs over on LS1Tech.
And they make all the adapters for sensors and vacuum stuff.....just have to hunt it down.

I'm more interested in the injectors to power that system. 42lb ers minimum I'd say.
and fuel pump....you're gonna need 60lbs.

 

[franky996]

Today I was able to finish the last bits of the install and fire it up for the first time. Love how it sounds. Next is let it run longer and drive it around for a bit to make sure the transmission shifts and the rear end gets settled in, then dyno tuning time

Short clip of it running

 

[Rocket Man]

Today I was able to finish the last bits of the install and fire it up for the first time. Love how it sounds. Next is let it run longer and drive it around for a bit to make sure the transmission shifts and the rear end gets settled in, then dyno tuning time

Short clip of it running

Sounds mean.

 

[Tonyrodz]

Sounds like a beast! I live that intake. Do you know what you're putting down to the wheels? Of course we'll need a video on your 1st test drive. What are you doing for exhaust?

 

[franky996]

Sounds like a beast! I live that intake. Do you know what you're putting down to the wheels? Of course we'll need a video on your 1st test drive. What are you doing for exhaust?

Don't know the power at the wheels yet, that comes when we dyno tune it. The exhaust is Speed Engineering long tube headers and a Flowmaster muffler with a down turn exit

 

[Tonyrodz]

Don't know the power at the wheels yet, that comes when we dyno tune it. The exhaust is Speed Engineering long tube headers and a Flowmaster muffler with a down turn exit

I have the 1 3/4 Speed Engineering with an MBRP muffler exiting at the stock location with the oem pipe.

 

[franky996]

I have the 1 3/4 Speed Engineering with an MBRP muffler exiting at the stock location with the oem pipe.

Your truck sounds great.

I haven't decided yet whether or not I am going to change my exhaust setup or not. I decide that once I drive it for a while and how I like or dislike the sound, especially inside the truck

 

[Tonyrodz]

Your truck sounds great.

I haven't decided yet whether or not I am going to change my exhaust setup or not. I decide that once I drive it for a while and how I like or dislike the sound, especially inside the truck

Makes sense. I have alot of drone with mine, which is annoying.

 

[SRQYukon]

Be sure to post your dyno report after the tune. What MAF is that?

 

[franky996]

Be sure to post your dyno report after the tune. What MAF is that?

There will be a dyno video and graph. The MAF is stock, or are you talking about the throttle body?

 

[franky996]

Just a small update. I changed the exhaust tubing and muffler setup. At first I ran it like I had it before the build, with the Flowmaster muffler and 3" downturn after the muffler. But Honestly that was to loud for a daily driver. The headers and no cats really made that thing loud. Now I run 3" stainless tubing all the way, with a 12" Vibrant resonator/muffler after the merge pipe, then a bigger Vibrant muffler ( you can see through it) and another 12" long Vibrant resonator just before the exit . There is a V band connection right where the axle is, so you can't see it in the picture. Much better now, still loud and screams when you step on it but much quieter at idle and cruising. Almost done with putting the 500 miles on it , then oil change and the dyno tune

 

[rockola1971]

That intake is sweet! Engine sounds great! Nice work!

 

[franky996]

Brake upgrade. Wilwood 16" big brake kit with 6 piston calipers. I also got the parts for the hydro boost conversion. Installing the brakes is pretty straight forward. They tell you to put Loctite 271 on the bolts, which would have been nice to include in the kit, since it's something needed. No big deal, I got a bottle at the auto parts store. You will need a torque wrench and 40 Torx bit. Everything else is just regular wrenches and sockets

The difference in size to the stock rotors is staggering

Only parts missing right now are the brake lines and the brake fluid, then I can finish the brakes up.

 

[Rocket Man]

Brake upgrade. Wilwood 16" big brake kit with 6 piston calipers. I also got the parts for the hydro boost conversion. Installing the brakes is pretty straight forward. They tell you to put Loctite 271 on the bolts, which would have been nice to include in the kit, since it's something needed. No big deal, I got a bottle at the auto parts store. You will need a torque wrench and 40 Torx bit. Everything else is just regular wrenches and sockets

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The difference in size to the stock rotors is staggering
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Only parts missing right now are the brake lines and the brake fluid, then I can finish the brakes up.

Nice. I put the Wilwoods on both my trucks. Awesome brakes.