Weber/Edelbrock 500 Carburettor kit with Offenhauser manifold to fit all Rover V8 Engines


Brand New Weber 500cfm Carb/Carburettor and JWR Offenhauser Intake Manifold Complete here offered with our comprehensive Fitting Kit too, for an easy, fast, self assembly.

(The ultimate all round Carburettor solution & choice for all Rover V8 engines from 3.5 to 4.6 litre capacity.)

Here you can see listed the Ultimate full kit, designed to fit all Rover V8 Variants in all car types from 3.5 litre to 4.6 and even for bigger capacity too.

What is this listing for?

A Brand New Boxed Weber/Edelbrock 500 cfm Carburettor and JWr Offenahauser intake manifold (pictured further below in this listing). This listing also includes a Brand New complete Fitting Kit for this carburettor and Intake Manifold for an easy, fast, self assembly.

Why we don't sell The Holly Carbs for Rover V8.

The most affordable upgrade carburettor option has been for many years theHolley 390cfm. This carburettor has been used on all capacity RoverV8s, and with fine tuning can provide good fueling and power for the V8engine up to 3.9 Litre. However, the problems have always been that itis too large (390cfm) for part throttle economy/torque, and too smallfor more serious top-end power gains, especially on larger capacityengines. So, unless you are into drag racing, our advice would be toforget it.

Although the Weber is 500 cfm it is only approx. 200 cfm onpart throttle, the additional 300 cfm comes in on the secondary part ofthe carburettor. The advantage of the Weber is that the secondaries areboth vacuum and throttle operated (unlike the Holley which is vacuumonly). This has the advantage as sometime the engine is under load(vacuum) however you are only on part throttle and the engine does notneed the secondaries open.

Items included in this listing
  • 1 x Brand New boxed Weber 500 cfm Carburetor
  • 1 x JWR Offenhauser Intake Manifold - Dual Port
  • 1 x Booklet detailing fitting, setting up, jetting and spares
  • 1 x DVD showing you how to install and setup this carburettor
  • RPi's 25 years of experience with the Rover V8 engine.
  • And A Brand New Comprehensive Complete Fitting Kit is also available and detailed in this listing please see below for more information.

The Weber 500 is better off road

Unlike the Weber, the Holley float bowls are mounted both in front and behind the carburettor, causing fuel starvation and fuel flooding problems when off roading on steeper inclines. The Weber's float bowls are either side of the carburettor, thus almost completely alleviating this type of common problem.

Proven time an time again, beyond doubt

In the past ten years of supplying this carburettor type, along with our many hundreds of customers we have achieved a great deal of combined Road & competition, off-roading (trailing) with the Weber and have found almost no fuel starvation or flooding problems even when operating on steep inclines or with faster cornering. Indeed compared to other 4 barrel type of carburetors its near imposable to find fault with the Weber - Edelbrock 500 style.

This Carburettor is made by Weber, however it is marketed by Edelbrock and therefore has an Edelbrock sticker on it.

Dual Port manifold - As included here

The Dual Port manifold is designed to be considerably lower than the Dual Plane, (detailed above) so is supplied mostly for 2wd drive V8 applications. By design, it splits each intake port into 2,the upper section only supplying fuel at lower throttle settings, and the lower section supplying additional fuel when higher performance is required. With this intake you can expect superb part throttle economy & torque as well as superior top end performance.

Dual Plane intake - Not included in this listing however can be supplied, please enquire.

Shown below is the Dual Plane intake which is often too tall for 2wd models so normally supplied to 4wd conversions. The advantage in design is that it offers great torque and bhp gains as would be expected when combined with the Weber Carb upgrade, and has the best ability for high revving, higher performance engines and for low-end idle. Emissions are normally improved, but the dual port manifold (below) does it even better.

What else is required to fit this Carburettor and manifold?

Nothing, that's right absolutely nothing! We have provided a comprehensive fitting kit available with this Intake Manifold so that you should not need to leave your garage to fit this superb upgrade. Details about the fitting kit included is listed below.

Information on the Fitting kit that complies with this Carburettor and Intake Manifold is detailed below.

Please note that this listing Includes the Weber 500 carburettor and intake manifold as seen above at the top of this listing.

There are many who offer lower cost Weber 500 carburettor kits.

We could too, however, we feel that you should have absolutely everything at hand and everything you need to complete the job without last minute panic buying due to component shortfalls. Also we believe that all components should be completely relevant and correct for the job. To this end we have added this informational list as an aid to ensure you have the correct parts to easily achieve the correct results.

Limited V8 carburettor options

The only affordable upgrade carb option has been for many years the Holley 390cfm. This carburettor has been used on all capacity Rover V8s, and with fine tuning can provide good fuelling and power for the V8 engine up to 3.9 Litre. However, the problems have always been that it is too large (390cfm) for part throttle economy/torque, and too small for more serious top-end power gains, especially on larger capacity engines. So, unless you are into drag racing, our advice would be to forget it.

The Weber 500

Although the Weber is 500 cfm it is only approx. 300 cfm on part throttle, the additional 200 cfm comes in on the secondary part of the carburetor. The advantage of the Weber is that the secondaries are both vacuum and throttle operated (unlike the Holley which is vacuum only). This has the advantage as sometime the engine is under load (vacuum) however you are only on part throttle and the engine does not need the secondaries open.

Its better Off Road

Unlike the Weber, the Holley float bowls are mounted both in front and behind the carburetter, causing fuel starvation and fuel flooding problems when off-roading on steeper inclines. The Weber's float bowls are either side of the carburetter, completely alleviating the problem.

Below you can see comprehensive details of all that is truly essential and including uniquely in our listing

Items included in this listing. (Picture, description and quantity)
  • CV - Composite Valley gasket. We use composite as standard as it seals better than a tin Valley gasket x 1
  • VR - Rubber seals for Valley gasket- Re-using old ones will lead to oil leaks x 2
  • TC - Throttle cable universal fitment - With the 4th carburetor-to-manifold bolt attached x 1
  • CC - Choke cable universal fitment - will fit 2WD and 4WD x 1
  • PH - Plenum hose Breather hoses - Preformed so no kinks will develop in the hose x 1
  • WH - Length of water hose - Adequate for all specifications x 1
  • TH - Thermostat housing - Available in 2 wheel or 4 wheel drive versions x
  • CF - 14" Chrome Air filter (2" or 3" height) x 1
  • PF - Paper Air Filter Element x 1
  • BF - Fuel banjo for connecting the fuel to the carburettor x 1
  • BC - Bolts to bolt carburettor onto manifold (4th bolt is on the throttle cable) x 3
  • SW - Spring washers go onto bolts x 3
  • TG - Thermostat gasket x 1
  • WO - Water outlet gasket x 1
  • JC - Jubilee clips to connect the water hose x 2
  • TM - Throttle cable modification needed for 4WD vehicles x 1
  • As well as the Brand New Intake Manifold as detailed and described at the top of this listing.
  • Please be Aware - The power plenum we offer free does not included the standard filter, this is available separately but not included.

Items not included in this kit but readily available through our eBay shop:
  • Kick down linkage (For automatic gearboxes)
  • Calibration kit for jetting the carburettor

  • The picture below offers a view of the 2WD & 4WD variant as previously fitted to a Land Rover and Rover MGB. You can also see that the Land Rover is running the edelbrock manifold and carburettor with the power plenum. The MG is running the same system only a smaller power plenum and the JWR Offenhauser manifold, due bonnet clearance restrictions.

FAQ Zone

  • Is it possible to Visit Rpi. for collection, further information or for parts to be fitted.
    For sure we have many customers from all over the world, that not only visit us but enjoy our unique hospitality, as well as our in-house workshop facilities that can cater for anything from major rebuilds, restorations, engine fittings, LPG conversions. As well as drop in chipping and ignition system upgrades. Holly our Engine builder (Head Chef maybe) can always find the time to show you around the world of V8 Rover engines and explain all variants and upgrades.

  • Is Your location in 'North Norfolk', a great place to visit!
    No matter where you are located in the world a visit to us and our area, whether for the day, a week or even for a weekend in itself can be very, very rewarding, We can happily offer you information and assistance for accommodation ranging from our favourite traditional eighteenth century Norfolk country house Hotel, the Norfolk Mead, or Modern Hotels, Norwich central Hotels or from a chosen range of local bed and breakfast (B&B) establishments.
    We can also supply information links to ferry and airports to help, what's more as I have a deep regard for all things local to Norfolk you can find a wealth of local scenic information here, this is a unique local web site with some content supplied by myself.

  • Whats more, Now with online 'You-Tube'. videos too.
    To help give you the real feel of all we can offer, what we can achieve and the standards we aspire too we now have a space on 'You-Tube' for your enlightenment. ( to afford you a unique, real time snapshot of what you can expect from us. What's more, to see, feel and genuinely experience the passion we have for what we do and what we can do for your V8.

(See our other eBay items)

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RPi Engineering International Ltd.
Wayside Garage,
Holt Road,
NR10 3EE
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Technical specifications