LML Duramax Engine - Engine Builder Magazine

LML Duramax Engine

Just like most who become enamored with diesel engine work, Ray McClelland Jr. started tinkering at a young age. A new transmission, new clutch, upgraded tune and a turbo, and now he's made it a career creating diesel performance at his shop, Full Throttle Kustomz Diesel. Ray recently finished this LML Duramax build, which is ready to take on a drag race, a sled pull and a dyno run, but it hasn't forgotten its street manners. Find out what went into the build!

Diesel of the Week is presented by

Growing up in the Pittsburgh area, Ray McClelland Jr. learned a lot from watching his dad work on cars and run his performance shops. He would even join him at the race track to see the hard work pay off. Ray became more and more engrained in the world of motorsports every day. He then got into racing dirt bikes for KTM where he began tinkering with engines.

“I was always the kid who would take things apart and try and rebuild it,” McClelland Jr. says. “With all my dirt bikes, I was tearing carburetors apart and seeing how things worked. I would play with the jets and play with everything to see how I could better it – even at a young age.”

Ray ended up getting a Dodge Ram in 2007, and heard of people making 600 horsepower – at the time. With the piquing his interest, Ray now had a new goal to strive for!


“I started tinkering with things and got a newer transmission,” McClelland Jr. says. “I ended up upgrading the clutch and upgrading the tuner, which led to a turbo. That started my whole craze with diesel performance.”

Ray’s dad now has a performance shop out in California, but Ray set up his diesel shop, Full Throttle Kustomz Diesel, in Boardman, OH in 2016. The five-employee, 6,000-sq.-ft. diesel facility has a chassis dyno, engine and transmission assembly rooms and tear down rooms. Full Throttle Kustomz (FTK Diesel) pretty much does it all when it comes to diesel performance.

“We do Duramax mostly and a fair amount of Cummins and Powerstrokes,” he says. “We’re a specialty shop, so we’re not a general repair like most of the diesel performance shops you see. We don’t accept just anybody, but we’re more than happy to refer people to other reputable diesel repair shops.

“We build engines from mild to wild. Even our stuff that just has basic tuning, we’ll do some substantial upgrades. With Duramax engines, they’re pretty prone to holes in the pistons and breaking crankshafts. Even if it is just a basic engine build, we’re building it with that in mind. We use forged cranks, updated cast pistons, forged rods, hardened bearings, and typically an alt-fire camshaft to try and balance out the distribution of load on the crankshaft.

“Our low end works great for the guys who are towing and street driving. Then we have a handful of trucks that are over 2,000 horsepower with Cummins and Duramax platforms.”

FTK Diesel works closely with outside machine shops as well as Wagler Competition for its machine work. The shop also does custom tuning and transmission builds in-house.

Typically, FTK Diesel’s mild to wild engine builds fall into three different categories, and the shop will adjust them based on a customer’s needs. Recently, the shop built an LML Duramax engine for a customer who wanted to do it all.

“This engine is in a 2014 Chevy 3500,” he says. “The customer wanted a vehicle that he could drive on the street, but still be able to put a good dyno number down if he was at a truck event. He also wanted to be able to drag race and truck pull it if he wanted to. He kind of wanted to have the option to do everything, but he wanted to keep street manners in mind.”

The customer told FTK Diesel he wanted 1,000 horsepower and off the built went.

“We sent the heads and block to Wagler [Competition],” McClelland Jr. says. “We had them open up the stock cylinder heads and they did a five-angle valve job. On the block, we always have the line hone checked and the block surface checked.”

For the internals of this all-around Duramax build, FTK Diesel incorporated a Wagler Competition rotating assembly, which has a Callies crank, Wagler rods and de-lipped, cast pistons, as well as Wagler’s alt-fire camshaft. The shop always uses ARP hardware, and this build has ARP for the main studs, rod bolts, the rocker support bridge and head studs.

The LML Duramax also features Wagler’s valvetrain components to spice up the stock heads, a Wagler pinned and shimmed, high-pressure, high-volume oil pump, and Mahle bearings.

“Depending on the build, we use Steed, AFE or PPE manifolds,” he says. “This build uses a PPE manifold and has compound turbos – 80mm and 69mm. We used S&S Diesel Motorsports for fuel injectors and injection pumps. We used a Fluidampr for the balancer, a SunCoast billet flexplate and a Mishimoto intercooler.”

Behind all of that, FTK Diesel has a few different levels of Allison transmission builds the shop can incorporate.

“This engine got an Allison transmission with billet shafts, billet hub, billet planetary set, added clutches, and a quad disc torque converter from Diesel Performance Converters,” he says.

To top off the LML Duramax build, as well as all of the engines FTK Diesel sends out the door, Ray adds AMSOIL for peak performance.

“My father has always been a big fan of AMSOIL, so it’s been in my family’s vehicles for the majority of my life,” he says. “Personally, I’ve been using AMSOIL since 2007 in my stuff. I even put it in my lawnmower. We use it in everything.”

All said and done, the LML Duramax cranked out 998 horsepower and 1,860 ft.-lbs. of torque, making this one satisfied customer!

The Diesel of the Week eNewsletter is sponsored by AMSOIL.

If you have an engine you would like to highlight in this series, please email Engine Builder magazine’s Editor, Greg Jones at [email protected].

You May Also Like

Single-Turbo 5.9L Cummins Engine

Aaron West has done a few smaller scale builds to date, but he recently finished up a “Frankenstein” truck that is pretty impressive. The body is a 1990 Dodge D150, while the chassis is from a shortened 2003 Dodge 2500 4WD, and the engine is a turbocharged 5.9L Cummins. It’s our Diesel of the Week!

Dodge truck and 5.9L Cummins engine

It’s not hard to see the vast amounts of dedication people have in the diesel community – look for more than a few minutes and you’ll find guys and gals all over the place who have fought tooth and nail to build up their diesel passion to wild levels. Many start from a young age and build their lives around diesel trucks and engines, and we think that’s pretty cool to see.

All-Billet Duramax Drag-and-Drive Engine

Having been put on the back burner due to Wagler Competition’s popular DX Duramax engines, this brand-new billet Duramax engine has finally made it to the forefront. Rather than being aimed at truck pullers, this lighter diesel engine is specifically designed for drag racers and drag-and-drive events. Check out what makes this Duramax unique.

Wagler billet Duramax engine
Billet Triple-Turbo 6.4L Cummins Super Stock Engine

During a recent visit to Scheid Diesel, we got to see what goes on in the Terre Haute, IN-based engine and machine shop. We also got a deep dive on the details of a $150,000, billet, triple-turbo, 6.4L Cummins Super Stock engine build. It’s the pinnacle of Scheid Diesel builds, so don’t miss what’s in and on this engine.

Triple-Turbo 6.4L Cummins Super Stock Engine

Addicted Performance Diesel prioritizes performance and specializes in reinforcing engines and transmissions for both daily use and high-performance racing. Just take a look at shop owner Jason Stott’s personal Super Stock pulling truck with a triple-turbo 6.4L Cummins engine in it.

1,500-HP 6.7L Cummins-Powered Cuda

The Plymouth Hemi Cuda is a quintessential muscle car for many gear heads. But who knew swapping a compound turbo 6.7L Cummins into a Cuda could make it even cooler? Randy Weaver of Weaver Customs did just that. Check out what went into this unique build!

Other Posts

AMSOIL OE 0W-40 100% Synthetic Motor Oil

AMSOIL OE 100% Synthetic Motor Oil is now available in the following viscosities: 0W-16, 0W-20, 5W-20, 5W-30, 10W-30 and 0W-40.

Scheid Diesel’s Billet Cummins Dragster Engine

One of the coolest diesel dragsters around belongs to Scheid Diesel. Shop owner Dan Scheid and machinist and drag racer Jared Jones work together on the billet Cummins-powered dragster. We caught up with Jared during the 2023 Ultimate Callout Challenge to get the details of what makes their Cummins engine tick in this Diesel of

Scheid Cummins engine
Paul Vasko’s LML Duramax-Powered Diesel Dragster

During our weekend at the 2023 Ultimate Callout Challenge, there were plenty of fun conversations, but speaking with drag racer Paul Vasko was definitely a highlight. His passion is contagious, and his diesel dragster is definitely badass, thanks in part to a turbocharged LML Duramax engine. It’s our Diesel of the Week brought to you

Paul Vasko LML Duramax
Mild vs. Wild: Scheid Diesel and a Pair of 6.7L Cummins Engines

When it comes to building diesel engines, Scheid Diesel is a shop perennially at the top of people’s lists. As such, we made the trip to Terre Haute, IN to visit with owner Dan Scheid and to see the various aspects of the business and discuss the builds of two 6.7L Cummins engines. Check out