To make big power, you run an aggressive cam profile with high lift. To maintain control of the valve train, the valve spring needs to provide adequate seat and nose pressure, and be able to last a reasonable life cycle in a sometimes brutal environment. In today’s performance engines, this is one of the most highly stressed components; for this reason, you should only consider the highest quality spring you can buy.

Our Pro-Wire 700+ kit uses super-clean alloy material spring wire developed for use in NASCAR engines for performance and longevity, suitable for high performance use with cams up to .715″ lift (more with longer valves). Kit is complete with titanium upper collars and moly lower collars . 10 degree moly keys included (titanium keys are available as an option); springs are 1.540″ O.D.

Our Full-Race spring assemblies have been designed to handle lifts of up to one inch in Evolution® and Twin Cam® racing heads. Springs are manufactured from the finest quality Kobe spring wire, with titanium retainers and 10 degree chrome moly keys (titanium keys are available as an option). Keys and collars will accommodate lash caps if required. Spring pockets must be enlarged and clearancing of the rocker boxes will be required. Recommended for racing applications only.

Weight 1 lbs
Country of Origin

Engine Type

, ,

Only logged in customers can leave a review.