Zerosport Dual Valve Springs Set of 16 Toyota Tacoma 2.4L 2RZ-FE 2.7L 3RZ-FE
The recent design of many engines is focused on lower possible parasitic losses and efficiency, the design of the valve spring needs to match these criteria also.
Valve springs on 3RZ/2RZ engines are just up to 7200 rpm but above or with the higher lift it would be safer to go with harder springs.
Our springs were designed and manufactured here with tighter manufacturing tolerances than OEM springs (and aftermarket versions) they are also 30% stiffer which we think is a great compromise between reliability, massive friction, and parasitic losses.