cool, my question is now almost answered. so joe stevens re builds historic motorsport engines. does/did he build them 'for' the above names, or re builds engines that were originally made by the above names that are now privately owned?

and f1 spec springs are springs made by a company who used to make springs for f1 cars but doesnt any more as f1 doesn't use valve springs. so they make springs to 'your' spec.

thanks for your time