High quality race spring kit that we use on all our 2jz build with stock good quality steel retainer.
-10 000 rpm peak
-13,2mm lift peak
Spring seat pressure on these springs is @106lbs, in comparisation brian crower singel springs have seat pressure @80lbs and brian crower double springs have 102lbs. So these springs are even stiffer than double springs from other brands like ferrea that costs 700 usd.