ƒ Specs O.D. 27.50mm I.D. 20.00mm Seat 56 34.20 (lbsmm) Open (lift) 154 10.5 (lbsmm) Max net lift 13.50mm Coil bind 20.70mm Rate 9.40 lbs/mm Retainer P/N RET-TS60/MA2 + (16) SEAT-TS/MA18I+OEM (use 97 + Cotters) Note This is for a complete set of single intake and exhaust valve springs. Retainers and spring seats are included if they are part of the kit. ** Images shown may vary from actual product **