Mercedes AMG 63 4.0 liter V8 Bi Turbo M177.980 177.880 engine block

the M177 engine block—the “Hot V” powerhouse of the AMG lineup—is highly sought after for both high-end repairs and performance builds. While the M177.980 and M177.880 share the same 4.0L V8 Biturbo architecture, they are designed for very different vehicle platforms and drivetrain configurations.

1. Technical Breakdown: .980 vs. .880

The primary difference between these two blocks lies in the casting of the lower crankcase and the oil pan interface to accommodate either All-Wheel Drive (4MATIC+) or Rear-Wheel Drive.

2. 2026 Market Pricing (Estimated USD)

By 2026, finding a “bare block” is rare; usually, these are sold as Short Blocks (Block + Crank + Pistons) or Long Blocks.

• New Bare Block (Genuine Mercedes):

• Used Short Block (Tested)

• Re-sleeved Block (Performance)

  • Note: Many builders in 2026 are choosing to re-sleeve these blocks with Darton sleeves to handle 1,000+ hp.

3. Technical Features of the M177 Block

• Closed-Deck Design: Derived from motor racing, providing maximum rigidity and high injection pressures.

• NANOSLIDE® Coating: The cylinder walls are coated with an iron-carbon alloy that is twice as hard as conventional cast-iron liners and significantly reduces friction.

• Zirconium-Alloy Heads: While you asked for the block, note that the blocks are designed to handle the extreme heat of the “Hot V” (turbos inside the V), which requires specific thermal management in the block’s water jackets.

4. Common 2026 Inspection Points

If you are purchasing a used block, check for these specific M177 issues:

1. Cylinder Scoring: Despite the NANOSLIDE coating, engines that have seen poor maintenance or excessive heat can show vertical scoring. A borescope is mandatory.

2. Main Bearing Wear: On high-mileage blocks, check the main bearing caps for heat discoloration, which indicates oil starvation.

3. Deck Flatness: Given the “Hot V” nature, blocks can sometimes warp slightly if they have experienced a major cooling system failure.

5. Interchangeability Warning

Can you put a .880 block in a .980 car? Technically, the core cylinder architecture is the same, but the mounting points for the front differential and axles on the .980 block are unique. Swapping a C63 (.880) block into a GLC63 (.980) is extremely difficult and requires custom machining or swapping the lower crankcase assembly, which is not recommended.