Boost alone is not the whole game. The real power comes from increasing air density, and that means cooling the charge before it enters the engine. That is why the intercooler matters whether the engine is diesel or gasoline, naturally marine or land-based, turbocharged, supercharged, or both. Here the focus is a water-cooled intercooling layout adapted from marine diesel thinking into a boosted big-block Chevy package. The core sits in the intake casting, charge air passes through it, and the denser air is turned into the runners. In marine use, the cupronickel core is built to live in saltwater service while carrying substantial water flow through the heat exchanger. The point is simple: the intercooler does not care what badge is on the valve cover. Its job is to pull heat out of the charge air and pack more oxygen into the cylinders. Do that well, and you have the potential for another 400 to 500 horsepower from density gain alone.
Gale Banks presents this as a Banks Power 360 information video rather than a sales pitch. The focus is an intercooling transfer: taking an intercooler concept developed around a marine diesel application and adapting it to a marine big-block Chevy. He notes that although many people associate his work primarily with diesel engines, his gasoline-engine work dates back to 1958, and he has been turbocharging since the mid-1960s. The project shown is therefore part of a broader engineering approach rather than a diesel-only exercise.
The first mockup shown is based around what Banks describes as a marine Duramax, identified here as a 7.0-liter 427 configuration. In the normal arrangement, the ram tubes beneath the mocked-up blower would instead carry a dedicated casting. That casting sits on top of the ram tubes and contains an intercooler core inside it. Air from turbochargers or a blower enters from the rear of the casting, flows upward through the intercooler core, then into the upper plenum section, where it makes a 180-degree turn and feeds the ram tubes below.
Banks explains that the casting also includes rails on top for mounting a supercharger. That layout creates multiple possible induction combinations from the same basic architecture. It can support a supercharged and intercooled setup, or a combined supercharged and turbocharged arrangement, which he refers to as a super-turbo system. The point is that the intercooler packaging is being designed as a flexible foundation for several forced-induction strategies.
The discussion then shifts to a big-block Chevy mockup. On that engine, Banks points out his exhaust manifolds, which incorporate water-cooled flanges and water-cooled ports. He says these manifolds were originally developed for offshore racing roughly four decades ago, but that the design, port configuration, and exhaust-flow capability remain current. In this application, the engine is being configured as a twin-turbo system.
He also highlights a new turbocharger family he calls the Centerline series of the Banks Sidewinder turbo. This design uses a map-width-enhancing compressor anti-surge system and will come standard with billet compressor wheels. The turbine housing and compressor discharge are both centered, which is the basis for the Centerline name and gives the assembly a symmetrical appearance. At the rear is a heat-shield housing, shown in black in the mockup, which is intended to be finished in either brushed or polished stainless steel depending on the finish of the compressor. The exhaust risers can also accommodate wastegates, adding further flexibility to the system layout.
Banks then points out the new turbine housing, which is also centered to match the overall Centerline concept. Inside the external heat shield is a heat blanket made with half-inch ceramic insulation encased in a basalt outer layer and retained with a large stainless snap ring. The purpose is clearly thermal management around the turbine section while preserving a clean, symmetrical installation. He notes that the final stainless components will present much better visually once polished, but the technical emphasis is on the centered flow path and the integrated heat containment.
Walking into the drafting room, Banks uses earlier engines to provide context for the current project. He points to one of his big-block Chevy offshore racing engines from years past, noting that it had been banned by the American Power Boat Association for about 25 years, although turbocharging is now allowed again. Those earlier engines were carbureted and were capable of running hundreds, and in some cases thousands, of miles at wide-open throttle while producing a nominal 1,000 horsepower.
His point is not simply the peak number, but the durability requirement. Sustaining that output for long periods on a big-block Chevy in marine service is far more demanding than making a short dyno pull at a higher number. He also points out an intercooler mounted over the intake manifold on one of those earlier engines, reinforcing that intercooling in marine high-output gasoline applications has long been part of his engineering work.
Banks returns to the manifold shown earlier and identifies it as a marine engine layout. The rails cast into the top of the manifold are there specifically to mount a blower above the intercooler system. He also references a complete marine super-turbo arrangement with a blower mounted on top of the system. According to Banks, a pair of those systems was built and tested in a 40-foot boat, and the program was aimed at potential military applications.
This establishes the current work as part of an evolving family of marine forced-induction systems rather than a one-off experiment. The same packaging logic supports turbocharging alone, supercharging with intercooling, or a combined super-turbo arrangement, depending on the engine and mission requirements.
The new development effort centers on adapting the intercooler concept to a serious tunnel-ram intake for the big-block Chevy. Banks says the tunnel ram is being converted to fuel injection and already places injectors high in the ports, which he prefers. That high-port injector placement also leaves room to add another set of nozzles lower in the ports if desired.
The plan is to place a new casting on top of the tunnel-ram flange. That casting will resemble the marine intercooler manifold concept shown earlier and will house the intercooler core internally. In other words, the marine diesel-derived intercooling architecture is being repackaged for a gasoline big-block Chevy induction system while preserving the same basic airflow and heat-exchange strategy.
The intercooler core itself is shown as a separate component. Banks identifies it as being made from cupro nickel, specifically so it can operate in saltwater service. End caps are fitted to the core: one serves as a turnaround cap, while the other provides the water inlet and outlet. The target coolant flow through the core is approximately 70 to 80 gallons per minute.
That detail underscores that this is a true marine heat-exchanger design rather than an automotive-style air-to-air intercooler adapted casually for boat use. The material choice, the end-cap arrangement, and the specified water-flow requirement all reflect the intended operating environment and the need for reliable heat rejection in saltwater conditions.
Banks closes by emphasizing that the intercooler concept is not tied to any one engine family. Whether the application is a diesel or gasoline engine, a big-block Chevy, Duramax, Cummins, or Ford, the intercooler itself does not care. Its job is to increase charge-air density, and that density increase is what creates additional power.
He summarizes the expected result in straightforward terms: the goal is another 400 to 500 horsepower through increased air density. In his framing, intercoolers are density machines, just like blowers and turbochargers. The entire project is therefore about packaging and applying that density gain effectively across different engine platforms, with the current focus on a marine big-block Chevy using a transferred intercooler concept from marine diesel development.