Racing shocks come in two types of valving. 50-50 valving refers to a shock which has the same valving rate for both compression (resistance pushing shock in) and rebound (resistance pulling shock out). The higher number the valve the more resistance the shock will have. A shock with a 6 valve will be stiffer than a shock with a 3 valve. Split valve shocks have different valving for compression and rebound. A split valve shock with 6-4 valves will have a 6 valve for compression and a 4 valve for rebound. This means the shock will go in harder than it will pull out. One mistake people make is trying to figure out what a shock valve is by pulling it in and out by hand. You can not figure out shock valving this way it can only be done on a shock dyno. Any other method will simply confuse you.
The table below is very helpful to make the right shock selection to improve the handling of your race car. First determine what problem your car has on the race track then select the appropriate shock to counteract the problem. If help is needed one of our sales staff will be glad to help you.