Anyone know any online suppliers of valves,valve springs, pistons bearings etc. Apart from the often overpriced Burton?

I bought quite a few x-flow parts from Scholar Engines, who are NOT the cheapest engine tuners & re-builders around. They were still far cheaper than Burtons.

So it's worth looking locally for engine rebuilders...

not sure if this is any use to you .

http://www.ultrapartsltd.co.uk/appguide/web_index.htm

You don't say where your located, but if you have a CAF, (Camberly Auto Factors), near you they are very good on price. HTH Ray