the YB is a better design with a better bore and stroke configuration
the Zetec can be tuned to near 500 bhp (thats the most the head can possibly flow)
interestingly - the exhaust ports on a Zetec are much less restrictive than a YB
Thats an interesting remark.
Will Gollop uses a zetec turbo engine in his focus and that has over 660bhp
The Megulars Focus in the States has well over 1000 bhp out of the Zetec too.
Do your research first.
:top