Compound-Turbo Stage 4 6.7L Cummins Engine - Engine Builder Magazine

Compound-Turbo Stage 4 6.7L Cummins Engine

Classic Car Studio went to D&J Precision Machine looking for a diesel engine to fit inside this no-expense-spared build of a 1956 F600. The result was a truck called Kingpin, which features a compound-turbo Stage 4 6.7L Cummins engine. Check it out!

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Last fall, D&J Precision Machine owner, Drew Pumphrey, was at our offices in Akron, OH for a video on valves with the team from SBI. During his visit, he shared that his shop was part of a crazy custom truck build and that the vehicle would make its debut at the PRI show in the D&J booth. Drew showed us some pictures and told us about the no-expense-spared custom build, complete with a D&J-built compound-turbo 6.7L Cummins engine under the hood.

1956 F600

When Drew shares info about a project, its usually something pretty incredible, and we knew we couldn’t only see photos of this truck, so we made sure to swing by the D&J booth during last December’s PRI to see this custom truck, a 1956 F600 named “Kingpin,” and its compound-turbo 6.7L Cummins engine, of course.

“The smiles per visit have been pretty good on this thing,” Pumphrey told us about having the truck in the D&J PRI booth. “Classic Car Studio reached out to us looking for a Cummins powerplant for this truck. They do tons of gas builds, tons of custom cars, and they wanted to do something different. Originally, they were looking for 12-valve stuff. We kind of convinced them to go common rail and a little more modern, especially after seeing renderings of the truck. It seemed like it fit better because it’s kind of a retro modern build.”

1956 F600

D&J Precision Machine, based in Cambridge, OH, did everything related to the engine work. The shop supplied the powertrain, fuel system, turbos, and transmission, in addition to the engine, which is D&J’s street performance Cummins. The engine features a Stage 4 cylinder head, an Exergy fuel system with Exergy 100% over injectors and a 12mm pump, and an S472 and S485 turbo from Stainless Diesel. That all combines to give this Cummins a good 1,000 horsepower. Additionally, the truck features a 48RE transmission from the guys at Firepunk and an ATE controller.

“It just came out awesome,” Pumphrey admits. “I still can’t believe that anybody could do this. There’s so many details. When they started building it, it was a regular cab truck originally. The fabricator who did most of the work said if you continued those body lines around, it only ended up like 3-feet wide in the back. They had to open the cab up and then that caused problems with the doors and everything, so they refabricated just about everything. The only thing that’s left is the windshield bezel from the original truck. Everything else they’ve touched, tweaked, adjusted, modified. It’s just amazing.”

6.7L Cummins engine

While the truck itself is a stunner, the engine is actually tucked away quite well under the hood and is located a little further back than you would typically expect. It gave them room for the compound-turbo setup, which Drew says sees about 70-lbs. of boost in this application.

“Our street performance Cummins is a stock block with 12mm main studs, our billet connecting rods, and then typically a Stage 1 head,” Pumphrey says. “They went to a Stage 4 upgrade mostly for aesthetics in this. They just really wanted that look of that new Stage 4 intake that we have on these.

6.7L Cummins engine

“Our Stage 4 head has got super alloy valves and they flow like 315 cfm, and it comes with our runner and plenum intake. That was the big thing they were looking for was the runner and plenum intake for the looks. Believe it or not, that intake, as big as it is, only weighs 10-lbs. We did that for the drag racers.”

As mentioned, the Cummins is tucked into the engine bay quite well, which is something Classic Car Studio handled themselves.

6.7L Cummins engine

“We supplied them with some mockup parts, like a mockup engine, transmission and turbo pieces, so they could start fitting things in the truck and they took it from there,” he says. “They had some questions, like, where do pipes go? How does this work? Because they weren’t diesel guys, but they tied it all together themselves.”

When it comes to custom builds like this 1956 F600, most people assume it’ll never see the street or be driven like it should. However, Drew told us that the owner does plan to drive it quite a bit.

1956 F600

“The customer drove it in here,” he says. “It’s not just a trailer queen. When we went to test drive it with them, we went around the block, and the thing had only been moved in the shop a couple times. They’re like, ‘Well, what do you think?’ I said, ‘It seems like it’s good to me.’ They went 90 mph down the freeway with this thing just cruising. The truck is a blast. It runs great. It’s a lot of fun.”

As Drew pointed out, this truck delivers a ton of smiles for both those driving it and those just taking in the sites. The truck sold at auction for $500,000 earlier this year, which is the highest a truck has gone for at Barrett-Jackson.

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].

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