Valve Springs

Make Model Pressure Comment
Supertech Single SPRK-MM18-S 56 Sustained revs to 7400rpm, mechanical over rev to 7800. N/A only (supermiata)
Light Double SPRK-1012-M18D 63 Sustained revs to 7800rpm, mechanical over rev to 8200. < 8psi boost (supermiata)
Heavy Double SPRK-MM18-D 74 Sustained revs to 8500pm, mechanical over rev to 9000. > 8psi boost (supermiata)

VVT is possible with heavy doubles, but is right on the edge of the phasor capabilities. […] All-in-all not worth it. (Ted75zcar)
Catcams PAC-S90015