KC Turbos’ New 2026 6.7-Liter Prototype Turbo

A white and gold 2011 F-350 King Ranch usually screams retired hauler, but this specific truck featured in KC Turbos‘ recent video hides a massive secret under the hood. After the original engine let go at 234,000 miles, the team didn’t just rebuild it; they swapped in a fully forged 2024 High Output 6.7-liter engine. To match that modern bottom end, they bolted on a 6.7-liter prototype turbo that aims to solve the age-old problem of lag on high-horsepower setups.

2024 High Output Powerplant Swap

Alex Leahy from Precision Diesel Works pulled off a serious feat by transplanting a 2024 High Output 6.7-liter engine into this older chassis. This isn’t just a junkyard swap; it brings a factory-forged bottom end capable of handling serious abuse. Alex broke down the hardware upgrades: “Here’s the famous 2011 we always talk about with the ’24 HO motor. It’s just the High Output option from Ford. Pistons, rods. It’s got a fully forged rotating assembly.” This foundation allowed them to push the tuning without fearing for the connecting rods.

Testing The 6.7-Liter Prototype Turbo

The magic really happens when they test it for a drive. Even if it puts down a staggering 1,429 lb-ft of torque, it behaves politely on the street. Alex noted the lack of compromise in the setup: “So, right now it’s at 1,429 lb-ft of torque. Driveability is like stock, though.” You get an immediate boost off the line without waiting for the tachometer to sweep past 2,000 rpm.

Managing Heat And Speed

Taking the truck out into the 111-degree Arizona heat provided the ultimate stress test for the cooling and air density. Most turbos struggle to light in these conditions, but this truck built 10 psi of boost instantly at cruising speeds. During a hard pull in sixth gear, the exhaust gas temperatures stayed shockingly cool. Alex and Cameron was blown away by the thermal management: “1,200 degrees EGT. That was seriously impressive.” To rein in all that newfound speed, the truck relies on massive Brembo brakes, keeping the certified sleeper safe on the street.

The Ultimate Sleeper Setup

This build successfully merges the reliability of a work truck with the heart of a drag racer. The combination of the 2024 engine architecture and this 6.7-liter prototype turbo eliminates the trade-offs usually associated with 650-horsepower daily drivers. It offers towing capability, stock-like manners, and a massive boost on command. Lewis wrapped up the experience with a clear endorsement: “If you want your truck to drive like this, tow like this, make boost like this, go check it out now.”