Hi I run the Zakspeed Mk1 replica, i am desperately trying to get it going for the festival. Just had to take the engine out again to fix a small issue. Hopefully get it back in tomorrow after work. As for the question on YB engines, it can be a bit grey. What actually is a YB. Is it the turbo engine built by Ford/Cosworth or a you talking about something else. Some of the engines running were not built by Ford or Cosworth they are modern Smith and Jones engines. A S & J engine started as a YB but ended up taller and made of aluminium and with there own cylinder head.