Dave Ellis	Specialist Rover V8 engine builder. Also supplies gearboxes and is a good source of general information. DROC discounts available.
Dunnell	Zetec engine builders
John Eales	JE Developments here, who are highly regarded V8 builders.
Landrover stuff	This site is nominally about landrovers. However, there's lots of stuff about Rover V8s there.
Raceline	Suppliers of Zetec performance parts, amongst other goodies.
Rover V8	All sorts of useful stuff about the Rover V8 engine
RPI	Just about the most chaotic site (albeit useful!) on the web, but still useful suppliers of Rover V8 bits. Discount available to DROC members.
V8 developments	Rover V8 parts and so on
V8 tuner	Another Rover V8 tuning site. This one looks quite good
Burton Power	Go faster kit suppliers. Curiously, their web site doesn't seem to include the phone number, which is 020 8554 2281.
Real Steel	Unfortunately they don't have a web site, but this is a truly wonderful supplier of all things for V8s, and some other bits and pieces besides. What's more, they are very knowledgeable and keen to advise. Phone 01895 440505 and ask for their catalogue.
Ashfield Motor Sport	Cosworth bits
Rimmers	Suppliers of everything for Rovers, including the engines.
Puma Racing	Lots of useful technical articles
Mountune	Engine component suppliers