Mk1 Focus RS - Zetec Blacktop + ST170 AREA6 Up-rated Valve Spring Set Transmission Finished in Anodized Blue

Finished in Anodized Blue

Smaller 25mm and 50mm rolls are available

Focus RS Mk1 Oil Return Pipe to fit standard and hybrid turbos

50mm rolls and large sheets are also available

Why Buy this Bonnet strut kit

Mk1 Focus RS - Zetec Blacktop + ST170 AREA6 Up-rated Valve Spring Set Transmission Finished in Anodized BlueTurbocharged and performance engines require more of a valve spring. The pressure within the intake valve is Boost pressure, and this acts upon the valve head, significantly reducing the valves seat pressure as the boost is trying to push the valve open. The same impact occurs on the exhaust valve head. Whilst Ford provided the Focus RS with a mildly uprated spring set to suit the turbocharged application, these become ineffective after 20psi boost,