Valve Spring

Valve spring free length 51.96 mm (2.045 inch)
Valve spring solid height 36.1 mm (1.42 inch)
Valve spring compression pressure 46.30 mm @ 340 +/- 17 N (1.82 in 76.5 +/- 3.8 ft. lbs.)
Valve spring compression pressure 383 mm (15.07 inch) @ 858 43 N (1.51 in @ 191 9.7 lbs)