Billet Aluminum Solex-to-Weber Carburetor Adapter Plates | Porsche 356 Super 90/SC & 912 | Pair

Billet Aluminum Solex-to-Weber Carburetor Adapter Plates — Porsche 356 Super 90, SC & 912 (Pair)

Precision-machined billet aluminum carburetor adapter plates for converting Porsche 356 Super 90, SC, and 912 engines from the original Solex carburetors to Weber IDF or DCNF carburetors. Sold as a pair (one per side) and made by Washburn's Metal.

The original Solex 40 PII-4 carburetors on these engines are notoriously difficult to keep in tune, parts availability is poor, and even a rebuilt set tends to drift out of sync within a few hundred miles. Many owners move to Weber 40 IDF or 44 IDF carburetors because they're easier to tune and better supported. The catch: the Weber bolt pattern doesn't match the Solex flange on the factory Porsche manifold. These plates bridge that gap — Weber pattern on top, Solex pattern on the bottom — so you keep your original manifolds and add Webers without permanent modification.

Vehicle Fitment

• Porsche 356 Super 90: 1959–1963 — Solex 40 PII-4 carburetor manifold
• Porsche 356 SC: 1964–1965 — Solex 40 PII-4 carburetor manifold
• Porsche 912: 1965–1969 — Solex 40 PII-4 carburetor manifold
• Other applications using the same Solex flange-to-Weber conversion

Important: These adapters work with the original Porsche Solex-pattern intake manifolds. If your manifolds have been replaced with Weber-direct manifolds, you don't need these adapters. Confirm your manifold flange pattern before ordering.

Key Features & Benefits

• Keep Your Manifolds: Bolt modern Weber carburetors to your original Porsche Solex-pattern manifolds without permanent modification.
• Fully Reversible: Manifolds aren't cut or modified — return to factory Solex configuration anytime.
• Standard Weber Pattern: Accepts the common IDF/DCNF flange, including 40 IDF and 44 IDF carburetors.
• Sold as a Pair: One plate per carburetor.

Technical Specifications

• Material: Billet aluminum
• Finish: Machined
• Configuration: Solex flange (bottom) to Weber flange (top)
• Sold As: Pair (one per carburetor)
• Manufacturer: Washburn's Metal

Frequently Asked Questions

• Which Weber carburetor do these adapt to — IDF or DCNF? The Weber flange pattern is the standard IDF/DCNF pattern used across the Weber sidedraft and downdraft line. Both 40 IDF and 44 IDF Webers bolt up. Contact us if you're running a less common Weber variant.
• Do I need new linkage and air cleaners? Yes. Solex-to-Weber conversion is a complete carburetion swap. You'll need Weber-specific linkage (typically a hex-bar style), Weber air cleaners, and matching jets/venturis for your engine's displacement and state of tune.
• Will this reduce performance compared to properly-rebuilt Solex carbs? No. A well-tuned Weber setup will match or exceed a properly-rebuilt Solex setup in driveability and reliability. The main downside is loss of originality — for a numbers-matching show car, keeping the Solex carbs is the more correct choice.
• Are these reversible? Yes. The conversion is fully reversible — your original Porsche manifolds aren't modified, just adapted. Save your original Solex carbs and you can go back to factory configuration anytime.
• Do they include gaskets? Contact us to confirm — gaskets vary by application and we typically supply or recommend the correct gasket sets based on your specific carburetor choice.
• Will they fit a 356A or 356B with the smaller Solex 32 carbs? No. These are sized for the larger 40 PII-4 manifolds used on Super 90, SC, and 912. The smaller-engine 356A/B uses a different manifold flange.

Explore Related Categories

Building out your Porsche carburetion? Browse Fuel & Intake, Porsche 356, and All Porsche.