Single-Turbo 3.0 Limited Pro Stock Cummins Engine

Single-Turbo 3.0 Limited Pro Stock Cummins Engine

This competition Cummins engine was built by Dustin Harrison and the team over at Apex Diesel. Check it out!

Courtesy of Engine Builder by Evan Laux

3.0 Limited Pro Stock engines are high-performance diesel engines used in truck pulling competitions. These engines are designed to produce massive amounts of power and torque, allowing the truck to pull heavy loads over a short distance.

The 3.0 Limited Pro Stock engine is typically based on a standard 6.7L or 5.9L Cummins diesel engine block, although Duramax engines are also used. The engine block is often sleeved with stronger materials and the crankshaft is also usually upgraded for increased strength; other heavily modified components are tacked on to increase performance even further. The 3.0 Limited Pro Stock engine is also equipped with high-performance pistons, heavy-duty connecting rods, and a custom camshaft. These components are designed to withstand the high stresses generated by the engine’s power output.

Dustin Harrison, owner of Apex Diesel Performance, is versed in building engines for this class. His Atlantic, PA shop opened its doors in 2014 and they’ve been completing quality, performance Cummins engine builds ever since. We first spoke with Harrison in late 2019, where he told us all about a Super Stock 6.7L Cummins he was building at the time.

The Limited Pro Stock engine he just finished for competitor Trent Krulik will have less horsepower on hand than that Super Stock Cummins build, but that doesn’t make it any less impressive.

“They’re about half the power of a Super Stock, but it’s an interesting class since there’s so many restrictions on how you make power,” Harrison says. “They’re air-limited, so they’re restricted to a 3-inch smooth bore inlet on the turbo, and you can’t have water injection. So, all we have is a 76mm turbo on there and it’s making close to 1,600 horsepower, which is quite a bit for a small, single-turbo application.”

You May Also Like

6.7L Turbocharged Cummins Engine

Jessie Harris’ Cummins-powered Chevy C10 won the Fastest Diesel honor at Sick Week 2023.

Courtesy of Engine Builder

Jessie Harris’ 1975 Chevy C10 has been passed down for generations. His grandfather purchased it new in ’75, before selling it to Jessie’s father in ’78, and then Jessie got his hands on it in the ’90s once he got his license.

Almost 50 years later and that same C10 has gone through quite a few changes. In fact, the two-wheel-drive Chevy just recently earned Fastest Diesel honors at Sick Week 2023. The machine was one of only a few diesels at the event and proved to be a stunner on the drag strip. It’s been known to leave the line with 50-psi of boost on tap and pull the front wheels off the ground in route to 1.1-second 60-foot times.

1,500-Horsepower LB7 Duramax Engine

The remarkable part of this engine is that even driving down the street, Rick Fletes is able to get about 30 mpg.

Single-Turbo 5.9L Cummins Engine

Steve Burton built this 5.9L Cummins engine for a Pro-Street diesel spec’d pulling truck. Check it out!

Compound-Turbo 5.9L Cummins Powered Mercedes Unimog

This unique 5.9L Cummins engine will be the powerplant for a 1965 Mercedes Unimog utility truck. Check it out!

1,000 Horsepower LB7 Duramax Engine

You don’t want to miss out on the details of this engine build.

Other Posts

Diesel Turbocharging Basics

There’s a reason diesels typically utilize compound turbo setups instead of twin turbochargers.

Dual Compound-Turbo 6.6L LBZ Duramax Engine

This 1954 Chevrolet 3100 houses a hefty 6.6L LBZ Duramax engine. Check it out!

2,200 Horsepower Compound Turbo 6.7L Cummins

This engine makes nearly 2,200 horsepower on nitrous. Check it out!

6.8L Cummins-Powered ’69 Nova

Under this hood is a beefy, Freedom Racing Engines-built 6.8L Cummins engine that makes around 3,100 horsepower.