PROX STEEL INTAKE VALVE/SPRING KIT CRF450R 02-08 PART# 28.SIS1403-2 NEW

latest addition to the prox program is the steel intake and exhaust valve & spring kits. this kit is offered as an alternative where the oem application uses titanium valves.
prox has now developed the steel intake and exhaust valve & spring kits, containing a set of steel intake or exhaust valves plus a set of specially designed stronger valve springs.  the prox kit just replaces the oem valves & valve springs and can be installed using the oem retainers, bases and valve seals.

special features in these kits:

• steel valves for increased durability and less wear under extreme conditions
• nitrided valves offer high microhardness while supersmooth surface finish reduces friction between stem and guide
• special stronger valve springs deal with the extra weight of the steel valves
• springs are made from premium chrome vanadium steel for higher performance and durability at high rpms
• fully rebuild able with oem retainers, bases and seals without the need of any further engine modifications
• comes as complete package for quick, easy and cost efficient replacement