1975 Porsche 911 Carrera Type 911/83 2.7L MFI Engine

This is a world-class, highly collectible powertrain. The Type 911/83 is the “Holy Grail” of 2.7L mid-70s Porsche engines because it is mechanically identical to the engine found in the legendary 1973 911 Carrera RS 2.7.

Finding one today, especially with a fresh rebuild completed in late 2025, places this engine in the top tier of the Porsche enthusiast market.

1. Technical Pedigree

• Type: 911/83 (Magnesium Case).

• Configuration: 2.7-Liter Air-Cooled Flat-Six.

• Fueling: Bosch Mechanical Fuel Injection (MFI)—the most desirable and visceral fueling system of the era.

• Power Output: Factory rated at 210 hp (matching the ’73 RS spec).

• Provenance: Derived from a Rest of World (RoW) 1975 Carrera. These cars were never officially sold in the US due to emissions, making the MFI variant much rarer than the US-spec K-Jetronic (CIS) versions.

Listing Details

• Type 911/83 2.7-Liter Flat-Six
• From RoW 1975 Porsche 911 Carrera 2.7
• Engine Number: ☆6650218☆
• Rebuild Completed 12/2025
• Bosch Mechanical Fuel Injection
• Cooling Fan & Shroud
• Air Filter Housing
• Muffler & Heat Exchangers

2. 2026 Market Valuation (Estimated USD)

Because the 911/83 engine is the correct “numbers-matching” replacement for a missing 1973 RS engine or a high-end 1974-1975 RoW Carrera restoration, its value is astronomical compared to standard 911S engines.

3. Engine Number Authentication

• Serial Number: ☆6650218☆

  • The “6” indicates a 6-cylinder engine.

  • The “6” (second digit) indicates the 911/83 engine type (Carrera 2.7).

  • The “5” indicates the 1975 model year.

  • The remaining digits (0218) indicate it was the 218th engine produced in that series for that year.

• Significance: This is a very early production unit for the 1975 model year, likely built in late 1974.

4. 2026 Restoration Details & Maintenance

Since the rebuild was completed in 12/2025, the following technical items are critical for its valuation:

• MFI Calibration: The Bosch pump must be calibrated to the specific fuel/air curve of the 2.7L engine. If this was done by a specialist like Pacific Fuel Injection or Gus Pfister, the value increases.

• Magnesium Case Treatment: Being a magnesium case (as opposed to aluminum), it should have been checked for “pulled” head studs. Modern rebuilds typically use Time-Serts or Case Bolts to ensure the studs don’t pull out under heat.

• Break-in Status: Since the rebuild is brand new, it likely still has “break-in” oil. The first 500 miles are critical—high-zinc oil (like Motul Classic or VR1) is mandatory for the flat-tappet camshafts.

5. Included Components

• Air Filter Housing: The specific plastic “snorkel” and housing for the MFI stacks is unique and very expensive to source if missing.

• Cooling Fan & Shroud: Should be the correct 11-blade fan. For a 1975 RoW Carrera, the shroud is typically Red (indicating the high-performance Carrera spec).

• Heat Exchangers: Ensure they are the thin-flange SSI style or original Leistritz to maintain the correct backpressure for the MFI system.