These valve springs our made out the same material that the top Nascar and NHRA team are using today. These valve springs will out last your
stock valve springs giving you better power over time. We also offer two different rates for different levels of performance.
The stock springs have rate at 26-75 our two rates are 36-75 for a little more installed pressure and same pressue at full lift, and 45-81 for a spring that is stiffer all of the way through.
Contact: Speedwerx Inc.