Valve spring used on 2012 Mustang Boss 302 engine
Higher seat pressure than base valve spring
300 N closed 700 N open Boss 302
265 N closed 650 N open Mustang GT
Installed height 40mm, same as Mustang GT
8000 rpm compatible
Use with cams up to 13mm lift
Can be used on base 5.0L Ti-VCT head
Sold in sets of 16