High performance beehive valve springs with titanium retainers for GR Corolla /GR Yaris. Remove OEM base and fit supplied base.

Intake: 100lb seat pressure at 35.0mm installed height. 198lb at 12.0mm valve lift.
Exhaust: 87lb seat pressure at 36.7mm installed height. 178lb at 11.5mm valve lift.
Spring coil bind height (solid height) 22.0mm.