SU Carburetor and Stromberg Carburetor Rebuilding Services

Jaguar E-type 4.2 Series II Twin SU HD8 Conversion Kit - The last one I’ll create.

The late Series II engines used Stromberg CD175 carburetors to meet emission standards, with a consequent reduction in power.  Regaining that power requires finding original and complete triple HD8 assemblies, or purchasing new production triple carbs, manifold, and linkage at a very high price.  But there is an alternative at lower cost, and less work.

The Stromberg inner and outer manifolds are 2 inch bore – and accept the HD8 carbs. Early XJ6 4.2 cars were equipped with twin HD8 SU’s and performed very well.  So I have developed a conversion kit to install HD8 twin carbs on the Stromberg manifold used on the E-type 4.2.  The linkage hooks up like the Stromberg set, the fuel hose is run to a custom fabricated fuel manifold in nearly the same location, and a longer choke cable will be needed.  I have found the fuel needle profile that works well.  Custom air filters can be found, or the original duct adapted to the HD8 bolt pattern, as one customer did.

I have built three of these conversions so far, and this one, the fourth is the result of what I learned doing the first ones.  Throttle response and power is amazing.  One owner believes it superior to the triples.

Installation of this conversion is a matter of a few hours.  It’s far easier than installing the triple set and manifold.  It does require mechanical experience and skill of course.  And the installation, done correctly, is fully reversible. From left to right the photos show the kit as completed, with gaskets, urethane fuel line, spring anchors, and instructions. Second are the satin nickel plated components, and the polished vacuum chambers. Third is the set adjusted on a spare manifold prior to being strapped together for easy installation.

 Phone or write for further information on the kit.