High performance stock size Black Diamond valve & Beehive spring kit. Smaller Domni valves available on special order.

Out-performs others because these springs are approx 1/2 the weight of dual springs and that raises your RPM limit and takes stress & heat off your motor. Cam flex is reduced and saved HP goes to the rear wheel. The conical shape eliminates the need for an inner spring and allows for a smaller lighter retainer. Longer spring length gives you a better linear rate than shorter springs. Includes black diamond valves, stellite tips, beehive springs, titanium spring retainers, spring seats and spring balancing shims. 1/32″ spring seats are commonly used on the street.  Choose thicker .065″ spring seats for racing.  Some custom heads need .1″ thick spring seats if the shoulder of the guide is too short for the amount of shims you are using.  Use your original keepers (more info).

Spring seats are supplied to fit either 750s with ½” guides or 850s with 5/8” guides. Some 850 after market guides may require 750 size bottom washers. $100 extra for smaller 1.4″ Black diamond Domni intake valves.

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