Kelford Valve Spring and Retainer Set for 2002-2008 Nissan 350Z, and 2003-2007 Infiniti G35

Featuring nano-peen and gold nitride surface finishing for superior strength and performance. This spring and retainer set suits high rpm high boost racing applications with vvt disabled. 95lb seat pressure. 195lb at 12.00mm lift. Maximum lift 12.50mm