GM 8.3L Duramax Diesel: Gale Banks Does the Math
Gale Banks breaks down the math behind GM’s new 8.3L Duramax V8 (L6P “Mongoose”), evaluating its 555 HP rating, CGI block, flat torque curve, and how a Derringer tuner on an L5P beats it today.
“The AREX (American Roadster Experimental) is an American car,” designer David Stollery explained, “and I feel Chevrolet has that image … the Heartbeat of America.” He was unable to get GM motors, but they did introduce us to Gale Banks. The guys at Banks built a prototype intercooled Twin-Turbo 6-liter Chevy, capable of in excess of 800 hp. They stuffed it in the middle of the AREX and shipped it to the GM exhibit at the Detroit Auto Show. This thing blew their minds!
In the 1950s they were dubbed “dream cars” when they dazzled the public at the General Motors Motoramas. Now the designation is “concept cars.” Today, every major auto show uses futuristic designs to attract larger attendance. Car companies use these same creations to test public reaction to ideas that have not yet appeared in production. Often these exhibition centerpieces don’t even have an engine or running gear, and sometimes aren’t even made from production auto materials. The AREX shown here is reflective of the best examples in the current crop of concept cars, but it is not a mere dream – it is destined for production. David Stollery, designer of Toyota’s 1968-72 Celica and Supra, as well as the highly acclaimed current Lister Corvette package, penned the AREX as a car for himself, but also to make a statement to the auto industry about his ability to produce leading-edge designs. When Jack Brown, an equally talented engineer who usually hangs his hat at Subaru’s advanced vehicle engineering department, learned of Stollery’s project, he volunteered to assume responsibility for the car’s underpinnings.
Gale Banks Engineering built the highly modified LT1 small-block for the prototype, but Stollery and Brown plan to offer that over-kill sort of power as an option. The base LT1 Corvette engine will be standard issue, mated to a ZF five-speed synchro rear transaxle. With a dry weight of less than 2,500 pounds, either engine will likely propel the AREX to 200-plus miles per hour. There are currently two production scenarios, ranging from a limited run of 20 to 25 cars to as many as 300. If your bankbook can handle about $165,000, you may want to keep your eyes on this one – but remember, creature comforts like air conditioning and a hardtop are no extra-cost options.
— Harry Newton


Gale Banks breaks down the math behind GM’s new 8.3L Duramax V8 (L6P “Mongoose”), evaluating its 555 HP rating, CGI block, flat torque curve, and how a Derringer tuner on an L5P beats it today.
Discover the dirty secret hidden in factory Duramax oil pans: an elevated drain plug that traps nearly a half-quart of contaminated sludge every oil change, and how the Banks CoolRunner pan cures it with complete drainage, FlowThru cooling fins, and +2 quarts capacity.
Banks introduces the world’s only true 5-inch DPF-back Monster Exhaust for 2024–2026 Duramax 6.6L trucks, using a patented Exhaust Pressure Module to cut backpressure without triggering check engine lights or melting trailers.
The Banks R866SC V8 6.6L Supercharged Diesel is an engineering powerhouse delivering 600-650 horsepower. Featuring a 3.8L Whipple supercharger and custom FEAD, this complete package is built for extreme performance.
Banks Derringer High Output tuner does more than just add power to your 2024–2026 Duramax 6.6L. Level 2 is specifically calibrated for improving fuel economyby adding more boost and optimizing fuel injection. And, Level 2 delivers an impressive 60 hp and 90 lb-ft to the wheels. For even more power, bump up to Levels 3-6 for power increases up to 86 hp and 178 […]
On all 6.7L Cummins, the factory grid-heater bolt is a known risk: if it breaks loose and reaches cylinder #6, engines are replaced—not repaired—an outcome costing north of $30,000. If you do nothing: the stock grid-heater bolt stays in the system—every start is a roll of the dice, and other replacements “fixes” still choke air flow. […]
Hector’s 2015 RAM 3500 threw an intake-heater code, then his remote start system stopped working. He pulled his intake plate after reading about the killer grid heater bolt. To his horror and delight, he saw “the nut had broken off and was just sitting there” — one drive from disaster. Rather than install another factory heater plate, […]
Your 6.7L’s stock intake elbow kills airflow with its sharp bend and restrictive air path. That added restriction makes the turbo work harder and dulls response. A Banks Monster-Ram intake elbow takes a different route—literally. We rerouted the #1 fuel line and replaced the restrictive grid heater which allowed us to open the air path and remove […]
RAM 6.7L engines can suffer catastrophic damage as a result of a bolt inside the factory grid heater, which melts and drops into the intake manifold. In this 8-minute close-up, you’ll see exactly what fails, where to look on your truck, and the upgrade that removes the weak link. If you own a 6.7L, this […]
Banks Power by the Numbers breaks down the real data behind a record-setting 2025—from millions of video views to testing fuel burned and parts shipped worldwide.
A Canadian diesel mechanic visits Banks Power and gets a firsthand lesson from Gale Banks on air density, cold starts, and real engineering behind reliable diesel performance.
“This video is a huge full-circle moment for me,” says an emotional Dave Bell, owner of Dave’s Auto Center in Centerville, Utah and the star of the wildly popular YouTube channel of the same name. “I’ve looked up to Gale Banks since I was 15 years old,” Bell continues. “His engineering and genius has paved the […]