Tapered valve spring Peugeot EP6 207GT / 308GTi / 408 - Citroen C4 / DS3 w / THP150 / 175 engine ST-SPR-MC56BE

All Supertech valve springs are made of Superclean premium chrome vanadium steel alloy for higher performance and durability at high RPM. The use of a high quality steel alloy provides the added benefit of better structural memory for all our springs. Our valve springs are computer designed, to ensure stress levels do not exceed the stress limits specified in the fatigue charts. Combined with our high-quality steel alloy, it gives Supertech valve springs greater strength in extreme conditions, giving the racing engine a serious advantage in both performance and durability. Supertech tappets are Manufactured from high-quality military-certified titanium alloy and CNC machined for a tight fit, our high-quality tappets are among the best in the industry Fits: Peugeot EP6 207GT / 308GTi / 408 - Citroen C4 / DS3 w / THP150 / 175 engine Dimensions : Wed Outer diameter of outer spring: 23.3 mm Inner diameter of outer spring: 16.8 mm Outer diameter of inner spring: 18.8 mm Inner diameter of inner spring: 12.3 mm Compressed pressure: 65 @ 33.6 mm Pressure expanded: 163 @ 10 lbs Maximum lift: 11.4 mm Compressed height: 22.2 mm Hardness: 9.8 lbs References: Use with factory plunger and retainer All Supertech valve springs are made of Superclean premium chrome vanadium steel, which ensures higher performance and durability at high revs. The use of high-quality steel alloy provides the additional advantage of better structural memory for all our springs.Our valve springs are computer designed to ensure that stress levels do not exceed the stress limits specified in the fatigue charts.Combined with our high-quality steel alloy, Supertech gives the springs greater resistance under extreme conditions, providing the race engine with a major advantage in terms of both performance and durability.Supertech cam followers are manufactured from a high quality, military-grade titanium alloy and are machined on a CNC to ensure a tight fit.Our high quality followers are among the best in the industry.Fits: Peugeot EP6 207GT / 308GTi / 408 - Citroen C4 / DS3 w / THP150 / 175 engineDimensions: Outer diameter of the outer spring: 23.3 mm Inner diameter of the outer spring: 16.8 mmOuter diameter of the inner spring: 18.8 mmInner diameter of the inner spring: 12.3 mmSeat pressure: 65 @ 33.6 mmOpen pressure: 163 @ 10 lbsMax net lift: 11.4 mmCoil bind: 22.2 mmRate: 9.8 lbsReferences: Use with OEM cam follower and valve seat