These are the specs from Federal-Mogul/Seald Power VS-1628 stock replacement valve springs:
Max. Dia..................1.252"
Wire Dia..................0.187"
Total Coils..............6.6
Solid Hight..............1.18"
Closed Hight..........1.71"
Closed Pressure...78 lbs *
Open Height...........1.278" (0.432 valve lift)
Open Pressure.......228 lbs *
Single Spring
* That works out to be 347 lbs/in spring rate.
Free length.............1.95"
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