Custom-Built 1,720cc Porsche Flat-Four Engine – Fresh 2022 Rebuild

A strong, freshly rebuilt runner for your air-cooled project. This is a custom 1,720cc flat-four engine meticulously rebuilt by the seller in 2022. Constructed using a blend of genuine Porsche case halves (including a section from a 1967 912), it features desirable performance upgrades like dual Weber carburetors, a 4-into-1 exhaust header, and a 12-volt electrical conversion. Sold as a complete, tested runner with spares, it’s an ideal “drop-in” solution for a 356, 912, or VW application.

Core Product Details:

• Engine Type: Custom Built from Porsche 616/1 & 616/36 cases

• Displacement: 1,720cc (via AA Performance Products pistons/cylinders)

• Rebuild Date: 2022

• Key Features: Weber Carburetors, 12-Volt System, 4-into-1 Header

• Case Stamping: Includes case half stamped ☆750640☆ (consistent with 1967 912)

• Condition: Rebuilt & Tested. Compression results available.

Build Specifications & Provenance

• Foundation: Built using a three-piece crankcase combining two Type 616/1 halves and a section from a 1967 Porsche 912 (case stamp ☆750640☆).

• Rebuild Work (2022): Top end cleaned and reassembled in stock configuration. Features new 1,720cc cylinders, pistons, and rings from AA Performance Products.

• Performance Upgrades:

  • Induction: Dual Weber carburetors with air cleaner housings.

  • Exhaust: Performance 4-into-1 exhaust header.

  • Electrical: Converted to a 12-volt system for modern reliability.

• Verification: Compression test results are provided, offering tangible proof of the engine’s mechanical health.

Features & Benefits

 Fresh, Documented Rebuild (2022): A recent professional rebuild offers peace of mind and immediate usability, avoiding multi-year wait times for an engine shop.
Performance-Enhanced: The 1,720cc displacement, Weber carburetors, and free-flowing header provide a noticeable power increase over a stock 1.6L engine.
Complete & Ready to Run: Includes carburetors, header, clutch, flywheel, and engine tins. The 12V conversion makes it compatible with modern electrical systems.
Includes Valuable Spares: Comes with a set of uninstalled 6-volt ignition components, adding value for purists or those with other projects.
Tested & Transparent: The provision of compression test data is a significant trust-builder, demonstrating the seller’s confidence.

Technical Notes & Compatibility

• What’s Included: The complete engine assembly, clutch, flywheel, tins, AND the extra 6-volt ignition components.

• Electrical System: Currently configured for 12-volt operation. The included 6-volt parts allow for reversion if desired.

• Status: Sold as a recently rebuilt, complete running engine. It has not been installed or run since the 2022 rebuild.

• Ideal For: A 1967-1969 Porsche 912 (as a robust, non-numbers-matching replacement), a 356 project, or a high-end Volkswagen Type 1, 2, or 3 conversion.