Ford broke its own rules to build the Shelby GT350’s engine, fitting the Mustang with a flat-plane-crank V8 more common in Italian exotics than American muscle cars. The 5.2-liter Voodoo V8 revs to a screaming 8,250 rpm — the highest redline of any production Ford V8 ever built — while producing 526 naturally aspirated horsepower. It’s an engine built for sustained track abuse, not just straight-line bragging rights. Few muscle cars from any era have sounded quite like it.
Ford‘s engineers had followed an unwritten rule for eighty-three years: production V8s don’t rev much past 7,000 rpm without something breaking. Then the small team building the 2016 Shelby GT350 decided that rule no longer applied. They gave the Mustang‘s new 5.2-liter V8 a flat-plane crankshaft, the kind normally found in European exotics, and tuned it to scream to 8,250 rpm — a number no production Ford V8 had ever touched. The result sounded less like a muscle car and more like something built for Le Mans. How did a mainstream Mustang end up with an engine like that?
Breaking Ford’s Own V8 Rulebook
The Voodoo V8 uses a slightly oversquare 93mm bore and 92mm stroke for a total displacement of 5,163cc, running a high 12:1 compression ratio on 93-octane fuel. Its flat-plane crankshaft — a design choice that changes the firing order and dramatically cuts rotational mass compared to a traditional cross-plane crank — is what let engineers push the redline to 8,250 rpm, the highest of any production Ford V8 in the company’s 83-year history of building them.
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526 Horsepower Without a Turbo in Sight
Naturally aspirated, the Voodoo produces 526 horsepower at 7,500 rpm and 429 lb-ft of torque at 4,750 rpm, working out to roughly 102 horsepower per liter — more than any other non-turbocharged street-legal engine Ford has ever built.
Built to Survive 8,250 RPM
Reaching that redline safely, over and over, required more than just a different crank. Ford fitted 14mm-lift camshafts, a rifle-drilled crankshaft that carries only about 15 percent of the rotational inertia of a conventional design, and a one-piece oil pan with an integrated windage tray to keep oil control stable under sustained high-rpm track abuse — details built for endurance, not just a headline spec.
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