1,900-Plus HP LLY Duramax Engine - Engine Builder Magazine

1,900-Plus HP LLY Duramax Engine

With aspirations of a 2,000-horsepower 6.6L LLY Duramax engine, Morey Logue of Interstate Diesel Performance is just on the verge of hitting his goal. Check out what's helping him get there!

Diesel of the Week is presented by

After trial and error and a lot of lessons along the way, Morey Logue made it his goal to hit 2,000 horsepower with his 6.6L LLY Duramax engine, a feat that only a few have conquered. He hasn’t made it quite yet, but he’s about as close as he could be.

Logue moved out to Layton, Utah, just outside of Salt Lake City, two years ago, and began working at Interstate Diesel Performance as a technician. It’s a one-stop shop that does everything from oil changes to performance overhauls. However, his current stint at Interstate isn’t where his project began.

“Way back in like 2010, a buddy of mine had a 12-valve Cummins, and I think my interest started around then as it did for a lot of people when they found out you could pull the fuel plate out of it to give it some more horsepower,” Logue says. “That was pretty cool, and we did a lot of tinkering on it. A year later, I bought my first Duramax.”

Over the next couple years, Logue bought and worked on a Cummins before focusing on other things. However, he was drawn back into the diesel world rather quickly.

“A buddy of mine had the Duramax I have now sitting in his barn for maybe two years or so,” he says. “I knew the thing was supposed to be pretty fast, so we discussed it for a while, then I finally made the deal.”

Logue started working on a race build straight away, and the initial goal was to make it into the Diesel Power Challenge. In 2020, he was in the running for the event, with his first setup making around 1,000 horsepower on fuel and 1,100 on nitrous.

Covid put a halt on the event permanently, but at the time, it was probably in the best interest for Logue to pass up competing anyway. He had guessed that the engine was on its last leg, and sure enough, a tear down shortly after confirmed his suspicions. Since then, he’s dropped another Duramax under the hood and started a journey to improve the performance of his LML as much as possible.

“It’s been a learning curve for sure,” he says. “We went through a lot of pushrod failures and had to switch brands, had some issues with the alternate firing cam and getting that to breathe right, and on one run it blew the V-band clip off the atmosphere charger and that caused a ton of issues.”

Trial and tribulation often bring the best results though, and Logue’s current setup boasts an incredible 1,925 horsepower. Just short of his ultimate goal, the truck is rocking some intense upgrades. The 6.6L Duramax is an LML block with LLY electronics in the truck.

The engine features Manton pushrods, Wagler valve springs, Wagler ported and polished heads, Ross forged pistons, and a Callies Ultra billet crank. Also from Wagler are the billet main caps and their Duramax street girdle. The girdle and everything else on the engine uses ARP hardware.

The turbo system changed a few times over the course of the build, with Logue eventually settling on a High-Tech turbo 83/87 in the valley and a Garrett GT5541R on the atmosphere. All of the fabrication work for the setup was done in-house by Interstate Diesel.

“The turbos work great and spool perfectly,” Logue says. “I discussed what more we could do with some people, and we decided that a second CP3 would work well, so now there are two injection pumps from Industrial Injection – a 12mm and a 10mm.”

A FASS 290 lift pump provides the engine with enough fuel and protects the injection system. Logue runs four solenoids from Nitrous Express and Turbo Smart wastegates, all with 35-lb. spring zones. A Mishimoto intercooler rounds out the engine build.

“I want to get that 2,000 hp at least once,” Logue says. “Maybe if I had held my tongue just right in the cab, I would’ve hit it already. But it’s coming. After that, I’ll probably downsize it a bit and get back down to around 1,300 horsepower for racing.”

Expect to see Logue and the team at UCC in a few weeks, where he’ll be putting his build to the ultimate test!

Diesel of the Week is sponsored by AMSOIL. If you have an engine you’d like to highlight in this series, please email Engine Builder Editor Greg Jones at [email protected].

You May Also Like

Turbocharged LML Duramax Engine

We all know Tony and Tyler Burkhard of Dirty Hooker Diesel have some awesome drag racing and truck pulling Duramax powerhouses. But, the shop’s employees also have some awesome diesel combos. Check out Evan Berry’s turbocharged LML Duramax diesel engine!

If you’ve been reading Engine Builder content for a while or have any attachment to diesel drag racing or truck pulling, you’ve heard of the Dirty Hooker Diesel (DHD) team. The name inevitably draws attention for its play on words, but the Harbor Beach, Michigan-based shop and its team is known for much more, particularly their expertise in Duramax diesel engine building.

Chase Wells’ Turbocharged 6.8L Cummins Engine

Chase Wells and his team at 1 Way Diesel Performance are capable of all sorts of different diesel builds from show stoppers to all-out race vehicles. This week, we highlight one of Chase’s own trucks, which features a single-turbo 6.8L Cummins engine! Check it out.

Compound-Turbo 6.0L Powerstroke Engine

Tyler Lambert’s Ford F-250 started as a project with a simple goal – to extract as much power as possible. Equipped with a 6.0L Powerstroke engine, the truck underwent a series of transformations, including a compound-turbo upgrade, that elevated it to the powerhouse it is now.

6.0L Powerstroke engine
First-of-its-Kind Compound-Turbo L5P Duramax Engine

While incredibly rewarding, nothing about this L5P Duramax build was easy for Lead Foot Diesel Performance – everything was custom or a first. From the billet crank to the one-off compound turbos, this L5P Duramax is impressive. Check it out!

L5P Duramax engine
Turbocharged 5.9L VP44 Cummins Engine

A few years ago, Jordan Blackard stumbled upon a 2nd Gen 2001 Ram 2500 that was being sold by Chase Fleece of Fleece Performance. After a few years of casual driving and fixing it up, he decided in 2022 to get working on a race build featuring a 5.9L VP44 Cummins engine. Check it out!

Other Posts

All About Diesel Fuel Lines

There’s more than might meet the eye when it comes to diesel fuel lines.

fuel lines
Why Your EGR Cooler Will Fail

In this episode of AMSOIL Garage we discuss the EGR Cooler, an emissions device that reroutes exhaust gases back through the engine to be burned a second time. This device sounds like a good idea, but it can cause issues for your engine, and due to the environment the EGR Cooler is placed within, the

Fire Rings for a Better Sealing Diesel Engine

As the typical diesel engine continues to see more performance, a simple job like fire ring installation can go a long way toward keeping your engine together and working properly.

fire ring block
Diesel Transmissions for Performance Applications

Today’s diesel crowd is using their truck like a truck, and like a toy too, which requires a robust transmission.

Firepunk diesel transmission