Cat Cams valve spring suitable for MX-5 NC 1.8 and 2.0. The spring preload when the spring is installed (without actuation of camshaft) is 31kg with a length of 34.5mm. The spring tension when fully actuated is 87kg with a length of 13mm. In order to be able to use this valve spring, it is essential to install the matching valve spring retainer, which you can order above under "Order accessories directly".
The price shown is for one spring, so 16 pieces are required to build a complete cylinder head.