Callaway and Waldoch Built 100 Supercharged Silverados. Here's the Hardware Behind 602 HP

Street truck guys have been building this truck in their garages for years: a late-model Silverado, a blower on the 6.2, the nose dropped, big brakes behind big wheels. Callaway Cars and Waldoch Crafts have now built it as a product. The 2026 Chevy Silverado Launch Edition makes 602 hp, and only 100 will be built.

LSX Magazine detailed the package, the first joint manufacturing project between the two companies. What stands out is that the power is only part of it. The brakes, suspension and wheel package were engineered to go with it, which is exactly where a lot of home-built supercharged trucks fall short.

The engine: an L87 with a blower

Each truck starts as a Silverado RST with GM's naturally aspirated 6.2-liter L87 V8. EngineLabs lists the outgoing 6.2 at 420 hp in stock form. Callaway adds a TripleCooled 2,650 cc roots-type supercharger, and the SC602 package is rated at 602 hp at 6,000 rpm and 560 lb-ft at 4,500 rpm.

Supporting hardware includes a high-flow air intake, a tuned ECU, a dedicated heat exchanger and a high-capacity intercooler water pump. That cooling is the point of the TripleCooled name. Roots blowers on big trucks heat-soak quickly when they are worked hard, and charge temperature control is what separates a dyno number from repeatable street power.

What the numbers say

Against the 420 hp EngineLabs lists for the stock 6.2, the SC602 package adds 182 hp, about 43 percent. Torque peaks at 4,500 rpm and horsepower at 6,000 rpm, so the blower is making its biggest contribution high in the rev range, where a naturally aspirated truck V8 normally starts to run out of breath.

It also helps to compare it with GM's own answer for 2027. The new L78 6.6-liter makes 481 hp and 501 lb-ft without a supercharger, according to GM, and The Drive reports its compression ratio at 12.5:1 against 11.5:1 for the outgoing 6.2. The Callaway truck still makes 121 hp and 59 lb-ft more than that, but the gap between a factory truck and a boosted one is narrower than it was a year ago.

The exhaust is a TIG-welded, low-restriction stainless system that exits through four integrated outlets, and the whole engine sits under a fitted carbon-fiber cover.

Lowered on purpose

The stance is not just cosmetic. The front end rides low on custom-tuned coilovers with double-adjustable dampers, which LSX Magazine says keeps the truck flat through corners. Dropping a full-size pickup changes its geometry and spring rates, and doing it with adjustable dampers rather than drop spindles and stock shocks is the more complete answer.

For the stance crowd, the wheel and tire choice is the other half. All four corners get 22x9.5-inch graphite wheels on 305/45R22 Toyo Proxes ST III all-season tires, a wide, low-profile setup that fills the arches on a lowered truck without going to rims so big they hurt ride and braking.

Brakes sized for the weight

Callaway's Big Brake package uses six-piston front calipers clamping 15-inch slotted rotors with braided-steel lines. A full-size crew cab with nearly 600 hp carries a lot of momentum, and big brakes are the part of a power build that tends to get skipped until the first hard stop from highway speed.

Outside, the truck gets a body-color grille, matching rocker extensions, illuminated Waldoch shield logos and blacked-out badging. Inside are leather and Alcantara seats with carbon-style stitching, Topographic Hydro-Graphics trim, custom sill panels and anodized aluminum pedal pads.

The last of the L87 trucks

The timing is interesting. GM's 2027 Silverado 1500 replaces the 6.2-liter with the new Gen 6 L78 6.6-liter, rated at 481 hp in stock form, according to GM. That makes the Launch Edition one of the final factory-backed builds on the outgoing engine, the L87 that so many street truck owners already know how to supercharge.

Pricing was not part of LSX Magazine's report. With only 100 trucks, availability will be the bigger question for most buyers. For everyone else, the build sheet works as a template: power, cooling, brakes, dampers and wheels chosen together, not one at a time.