RS Williams has been synonymous with conversions since our inception in 1968. If you're looking for more power, brakes with more bite, more responsive handling feedback, or more information on our famous upgrades for the DB4/5/6 4.2 and 4.7 litre engines and our V8 5.7 and 7 litre engines, you've come to the right place.
With over 55 years of engineering and motor racing experience with Aston Martins, the name RS Williams (Richard Stewart Williams) is synonymous with performance. This performance has been demonstrated in club and historic racing, as well as in the Aston Martin factory World Sports Car Championship effort, including the Le Mans 24 hour race.
We perform all engine conversions in-house, including removal, machining, balancing, reassembly, and testing in our environmentally controlled lab. Cosmetic enhancements to the engine bay are also done during this time.
After assembly, we break in and power-run the engine on the dynamometer to optimize carburetion, ignition timing, and other variables. We encourage you to come and view the work being carried out, especially the dynamometer testing.
Our package includes upgrades to engine mountings, differential mountings, and the differential carrier, and all engines run on unleaded fuel. After fitting the engine to your car we carry out an extensive road test prior to handover.
We are proud to offer our 7.0 Litre Aston Martin Engine conversion in 2 different configurations:
The Automatic specification focuses on mid-range torque to suit the automatic gear-change characteristics. It delivers punchy 440 bhp and an impressively flat torque curve that peaks at 520 lb ft.
The Manual specification is based on a 580x Vantage and offers a blistering 510 bhp and 530 lb ft of torque.
The image displays the power output graphs for the 7-litre manual and auto configurations.
We offer the best braking packages for your car that provide the ultimate stopping power while maintaining the car's original wheels and appearance.
We can provide different specifications for rebuilding your 6-cylinder engine.
The unit can be rebuilt in 3.7 or 4.0-litre form. Alternatively, we can enhance your car's performance by converting it to 4.2 or even 4.7 litres.
The image displays the power output graphs for our 4.2-litre and 4.7-litre engines below. Our 4.2-litre upgrade produces 290 bhp and 295 lb ft, while our 4.7-litre unit packs a mighty 330 bhp and 335 lb ft.
We upgrade suspension and brake systems on all Aston Martin models from DB4 onwards. We offer a handling kit specifically designed for DB4/5/6 models and another for all V8-engined cars. These kits include uprated road springs, Koni shock absorbers, a front anti-roll bar, and, on the V8, a rear anti-roll bar.
Our kits improve road holding while retaining an appropriate degree of refinement in ride quality. If you wish to further improve your car's handling, we can carry out our Roll Centre and Bump Steer modifications; this dramatically improves front-end turn-in. We also offer a rear Koni conversion for the DB4/5/6 range.
We can supply improved discs and calipers; the V8 conversion incorporates Brembo calipers, while the 6 cylinder upgrade utilises modified Girling 3 piston units. For V8 cars that still run the original lever arm shock absorbers, we can convert them to Koni telescopic dampers using an Aston Martin supplied kit.
We have installed a Superflow 901 in our environmentally controlled test room. Every engine we build undergoes a run-in process on our dynamometer, which features a pre-programmed, computer-controlled alternating load and speed. The operator in the control room monitors the process closely.
Once the engine has been run sufficiently, it undergoes a power run and optimization. The computer generates a graph, which the customer keeps as part of their car’s history.
Our dynamometer is also regularly used by other engine builders to test their own engines, including those from other brands.
Our advanced facilities enable our team to perform all necessary work on your vehicle to the highest standard.
We produce many unique reproduction and upgrade parts in-house and have our own fully equipped Machine Shop with facilities including:
CNC Machining – economically programmable for one-offs or small batch production.
Manufacture of unobtainable components.
Line boring of main bearing and camshaft housings.
Welding, bracing and re-machining of corroded and cracked cylinder blocks.
Manufacture of RS Williams developed components for road and race application.
We have four separate workshops that specialise in servicing, repairing, and upgrading classic Aston Martins. Each workshop focuses on a particular area of expertise:
Diagnosis, service, repair, fitment, upgrade, and enhancement of current and older style air conditioning systems.
Age-related care for braking systems.
High-quality engine tuning and refinement, thanks to our racing background and extensive experience with Aston Martin refinement.
Body and chassis repair of all types, from minor cosmetic fixes to full body-off, bare metal restorations.
Craftsman diagnosis, including troubleshooting unwanted noises, intermittent faults, and electrical problems.
Our climate-controlled engine building workshop rebuilds engines to the highest standards, including unleaded fuel conversion, full rebuilds, and race development. Our in-house engineers perform component machining, ensuring that the finished product meets our exacting standards. Every unit is tested on our own dynamometer by the same person who built your engine. We offer engine rebuilds with standard upgrades or our 4.2-litre or 4.7-litre conversion for six-cylinder units and our 5.7-litre or 7-litre upgrade, carburetted or fuel-injected, for V8 engines.
Our exceptional standard of assembly ensures reliable Aston Martin electricals, using original specification connectors and extra preventative measures. We provide the following services to our clients:
Discreet in-car entertainment packages.
Upgrades to instrument illumination and headlights.
Uprated charging systems.
Fire safety and extinguishing systems.
We take pride in the quality of our workmanship, which is reflected in the exceptional cars we stock. To showcase them in the best possible way, we have a modest 6-car showroom at the front of our premises.
Balancing rotating components is crucial for smooth and efficient operation. Vibration leads to energy waste and power loss. Our dynamic balancing machine with three reading heads and a digital display can balance crankshafts, flywheels, clutches, and brake discs perfectly.
Our dedicated cylinder head workshop’s facilities include:
Computerised valve seat cutting.
Hand-crafted inlet and exhaust ports and combustion chambers.
Performance and competition cylinder head development.
In our fabrication workshop we relish providing the following services:
Specialist AC/DC TIG Welding.
Gas welding, brazing and soldering.
Aluminium Fuel Tanks manufactured and modified.
Mounting brackets, battery carriers, chassis components, sump baffles etc.
Welding and repair of damaged aluminium castings.
Manufacture of special components to customer requirements.
Cylinder block and head refurbishment and strengthening.
Contact our dedicated restorations team who can guide you in the right direction
