Valve Spring

Free Length (Intake and Exhaust 41.8 mm (1.65 in.)
Squareness
Standard 2.0 mm (0.080 in. max.)
Service Limit 2.5 mm (0.100 in. max.)
Force/Tension at 26.25 mm (0.984)
Standard 724-788 N (163-177 lbs.)
Service Limit 688 N (155 lbs. min.)
Force/Tension at 35.25 mm (1.388)
Standard 293-329 N (66-74 lbs.)
Service Limit 278 N (63 lbs. min.)