One thing you'll notice on both types of shocks (vintage Hal Corp and Competition Engineering) is the lack of dust covers or shields. These are race shocks and because of that, there's no need for the extra hardware.

C-E shocks are adjusted by turning the upper collar on the body. Adjust the shock by aligning the notch on the collar with the adjustment setting range on the shock. Each front shock has an adjustment range of 10/90, 20/80 and 40/60. The first number (as an example, the "10" in a 10/90 combo) corresponds to the percentage of energy required to extend the shock (rebound) while the second number refers to the energy required to compress (bump) the shock. In drag racing terms, that's the same as a 90/10, 80/20 and 60/40.

The C-E shocks are adjusted by turning the upper collar. You adjust the shock by aligning the notch on the collar with the adjustment setting range on the shock. Each front shock has an adjustment range of 10/90, 20/80 and 40/60. In drag racing terms, that's the same as a 90/10, 80/20 and 60/40.

The C-E shock must be removed from the car to set the valving. Here's the drill: Before you make any attempt to set the valving, hold the shock upright and run it through it's travel ten or twelve times (this might take some serious muscle power initially). This purging effectively removes any aeration inside the shock. If you "stroke" the shock upside down or sideways, air is allowed into the shock and you won't get the adjustment right. Next, the shock is fully depressed (remember to maintain the upright orientation) and you have to line up the notch on the collar with the setting range on the shock body. With the shock still depressed, the adjustment collar is rotated clockwise until a click is heard. This means that the internal adjustment mechanism is now engaged. Basically, you have to rotate the notch on the indicator until it reaches the desired setting ("XF", "F" or "R"). You can now reinstall the shock.

These are the stamped setting codes on the body of the C-E shock: "XF", "F" and "R". The break down is as follows: "XF" = 40/60; "F" = 20/80; "R" = 10/90. If the shock is set at "R" or 10/90, then it only needs 10 percent of the total force to extend it. To compress the shock, 90 percent of the force is used.