Three Weber 45 DCOE Carburetors and Warneford Intake Manifold for Jaguar

Warneford intake manifold paired with triple Weber 45 DCOE carburetors is a classic high-performance induction setup for the Jaguar XK engine (3.4L, 3.8L, and 4.2L). While Warneford (an Australian brand) is no longer in active production, their manifolds remain highly prized by enthusiasts for their robust casting and period-correct aesthetics.

Listing Details

• 3x Weber 45 DCOE Carburetors
• Carburetors Produced in Italy
• Velocity Stacks
• Warneford Aluminum Intake Manifold
• Fits Jaguar 4.2L Inline-Six
• Throttle Linkages

1. The Warneford Advantage

Unlike some modern “long-runner” manifolds, the Warneford design is typically a short-runner manifold.

• Performance: It prioritizes high-RPM airflow and immediate throttle response, making it a favorite for “fast road” or club racing applications.

• Engine Bay Fitment: Its compact length is particularly useful in the E-Type (XKE), where clearance between the air horns and the inner fender (bonnet) is notoriously tight.

• Mounting: It generally uses a “soft-mount” system with MISAB O-rings and Cosworth-style rubber bobbins to prevent engine vibration from aerating the fuel in the float bowls.

2. Market Value & Recent Sales (2026)

As of early 2026, original Warneford setups have become increasingly rare, often appearing on specialist auction sites like Bring a Trailer.

3. Technical Setup & Calibration

For a standard Jaguar 4.2L engine, the following “baseline” jetting for Weber 45 DCOEs is recommended to work with the Warneford manifold:

• Chokes (Venturis): 36mm (Street) or 38mm (Performance)

• Main Jets: 145

• Air Correctors: 155 or 180

• Emulsion Tubes: F11 (The most common for Jaguar XK engines)

• Idle Jets: 55F8 or 60F8

4. Critical Installation Notes

• Linkage Compatibility: Warneford manifolds often require an overhead hex-rod linkage or a specialized side-pull cable system. The factory Jaguar SU linkage will not work without significant modification.

• Straight Port vs. B-Type Head: Most Warneford Jaguar manifolds are designed for the “Straight Port” cylinder head (found on 4.2L and 3.8L “S” models). If you have an early 3.4L or a standard 3.8L with a “B-Type” head, you must ensure the manifold port spacing matches your head.

• Fuel Pressure: Weber needle valves are sensitive. You must use a fuel pressure regulator (like a Malpassi Filter King) set to exactly 3.5 PSI. Excessive pressure from a standard pump will cause the carburetors to flood and leak.