I think you will get valve float somewhere over 8k? The valve lashes on our cars can only take so much rpm before they go useless. But I know there are not many guys on here who are hitting that kinda rpm.

1996 Mondeo 24v 4-door twin janspeed stainless pipe cat by-pass Phase 2 RS bodykit 16" cosworth alloys K&N RU3530 SVT TB/UIM/LIM poly bushings konis/bat springs/bar Pioneer MSDS Indiglos P&P heads 2005 Mondeo Zetec Tdci