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The M177's factory head bolts hold up remarkably well for a production engine — most tuned builds never need to touch them. But there is a hard threshold, and crossing it without head studs is how engines end up on the machine shop floor. Here's where the line is, what the job involves, and what it costs. Why Stock Head Bolts Fail at High Power The M177 uses torque-to-yield (TTY) head bolts from the factory. These bolts are designed to stretch slightly during installation, providing a precise and consistent clamping force on the head gasket. They work perfectly within the...

Building a forged AMG engine is a significant investment — and one of the best decisions you can make for a high-power build. But what does it actually cost in 2026? This guide breaks down the market ranges for AMG engine builds so you can budget realistically, understand what drives the price, and avoid surprises. Market Price Ranges (2026) Pricing varies by engine code, build level, and specification. These are general market ranges — not specific YPG pricing. Contact us for an exact quote on your build. Build Level Market Range (USD) What's Included Forged short block $8,000 – $18,000...

Mercedes-AMG uses two versions of its hand-built 4.0-litre twin-turbo V8: the M177 and the M178. They share the same bore, stroke, and hot-inside-V turbo layout — but they are not the same engine and they are not interchangeable. If you are ordering an engine build, turbo kit, or any internal component, you need to know which one you have. This guide explains the differences. Quick Comparison M177 M178 Displacement 3,982 cc (4.0L) 3,982 cc (4.0L) Configuration 90° V8, DOHC, 32-valve 90° V8, DOHC, 32-valve Turbo layout Hot-inside-V Hot-inside-V Oil system Wet sump Dry sump Block casting M177-specific M178-specific Oil pan...

If you are shopping for an AMG engine build, you have probably seen three terms: short block, long block, and crate engine. They describe different levels of engine assembly — and choosing the right one depends on the condition of your current engine, your budget, and your power goals. This guide breaks down exactly what each one includes, when to choose it, and how they compare. Quick Comparison Build Level What's Included You Supply Best For Short Block Block, crankshaft, connecting rods, pistons, bearings, internal seals Cylinder heads, intake, exhaust, turbos, accessories, wiring Healthy heads, bottom end needs rebuild Long...

The AMG GT platform demands heads that can flow under sustained high-RPM, high-boost, high-heat conditions — lap after lap. Our M178 CNC-ported heads are flow-bench developed for the dry-sump 4.0L V8, assembled with upgraded valvetrain, and sold as a matched pair. Built at YPG Motorsport in Kuwait, shipped worldwide. What Are CNC-Ported Heads? CNC porting reshapes the intake and exhaust ports using computer-controlled machining to our flow-bench program. Every port is cut to identical runner volumes and matched flow rates across all eight cylinders. On a twin-turbo engine like the M178, ported heads reduce pumping losses, improve turbo spool, and...