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M177 Forged Internals: What AMG Built Different and Where the Limits Are
AMG Built the M177 to Take Abuse — Here's What's Inside When Mercedes-AMG designed the M177, they didn't build a passenger-car engine and then add turbochargers. They built a motorsport-grade bottom end first and then wrapped a luxury car around it. The result is a 4.0-litre twin-turbo V8 with forged internals that can handle well over 800 HP on the stock rotating assembly — a claim very few factory engines can make. This guide breaks down exactly what AMG put inside the M177, why each component matters for high-power builds, and where the factory parts reach their limits. Forged Crankshaft...