The Porsche Type 911/03 engine is the legendary 2.2-liter flat-six that powered the 1970–1971 Porsche 911T (Rest of World / European spec). It is often considered the “sweet spot” of the early 911 engines because it combines the rev-happy nature of the short-stroke design with a significant torque increase over the earlier 2.0L models.

Listing Details

• 2.2-Liter 911/03 Flat-Six
• Engine Number ☆6113094☆
• Produced for 1971 Porsche 911T
• Rebuilt in 2024 by Porsche Tucson
• Weber 40 IDA Carburetors
• Cooling Fan & Shroud
• Distributor & Ignition Components
• Engine Tin
• Flywheel & Clutch
• Exhaust System

1. Key Technical Specifications

2. Identifying the 911/03

If you are looking at an engine in a car or on a stand, here is how to verify its identity:

• Type Stamp: Stamped on the engine case (usually to the right of the fan housing or on the vertical flange) as 911/03.

• Serial Number Range: For the 1971 model year, serial numbers typically start with 611XXXX.

  • Example: A number like 6113094 corresponds to a 1971 911/03.

• USA vs. ROW: The 911/03 is the “Rest of World” (European) engine. The US-market equivalent is Type 911/07, which included early emissions equipment (though power output remained largely similar).

3. Engineering Highlights

• The Case: This engine uses a Magnesium alloy case (AS41), which is incredibly light but prone to “pulled studs” if it has been overheated or high-mileage.

• Piston Cooling: The 1971 “D-Series” version of this engine introduced piston cooling oil jets as standard, a major durability upgrade that sprayed oil on the underside of the pistons to manage heat.

• Non-Counterweighted Crank: Unlike the 911S, the 911T engines typically used a non-counterweighted crankshaft. This makes the engine very “peppy” and quick to rev, though less smooth at extreme high RPMs.

4. Market Value (2026)

As of early 2026, the market for “loose” 911/03 engines is very strong due to owners looking for “period-correct” replacements.

• Core (Needs Rebuild): $8,000 – $12,000

• Professionally Rebuilt: $18,000 – $25,000+

  • Recent Sale Note: A freshly rebuilt 911/03 with Weber carburetors recently sold on Bring a Trailer for approximately $19,500.

    Pro Tip: Many 911/03 engines have been “upgraded” to Weber 40 IDA carburetors over the years because the original Zenith 40 TINs are harder to tune and prone to warping. While Webers offer a slight power bump and better parts availability, a 100% original Zenith setup is now highly prized for concours-level restorations.