This Ford Racing replacement hydraulic roller valve spring is a single spring intended for use with M-6049-SCJA cylinder heads. The listing includes seat pressure and dimensional data: closed-seat pressure of 135 (units per source), open-seat pressure of 365 (units per source), and a maximum lift equal to 0.700 in., providing the specified spring characteristics for the designated application.
Ford Racing Replacement Hydraulic Roller Valve Spring - Single (For M-6049-SCJA)