QA1 5Q686-3 Twin Tube Circle Track Shock Absorber 6C/3R Valving

The QA1 5Q686-3 is a large-body twin-tube steel shock absorber engineered for circle track racing applications. Formerly known as 51 and 53 series shocks, the 5Q series is a large body steel shock available in both bearing mount and stock mount configurations. This particular model features stock mounting with 6C/3R valving designed for GM mid-size and full-size rear applications.

Key Features:

• Two-piece bodies make it simple to disassemble and reassemble shocks, enabling quick trackside service and maintenance
• Black zinc coating ensures a very consistent finish, creating a tight seal every time
• Scalloped base loop increases clearances in tight areas like upper control arms and shock mounts
• Pistons are made of high-quality raw aluminum, minimizing variations that can be found in anodized parts
• Laser-engraved, black-anodized closure nut makes serial numbers and valving easy to read at the track or in the shop
• Upgraded seal kit minimizes leaks—especially in high-rebound applications

Tuning and Maintenance:

• 5Q shocks can be re-valved and rebuilt by racers in a matter of minutes using basic tools
• Valve the shock with bleed shims or drill out bleeds to maximize tunability
• The gland features relief cuts and a hyper screw port, making shocks easy to fill and bleed on assembly
• Compression tube uses a slip fit design to simplify the rebuild process
• Steel body shocks can be used in coil-over configurations using the appropriate kits (sold separately)

The 5Q series is designed for racers who demand maximum tunability and the ability to service their own shocks. From dirt to asphalt, QA1 gives you the performance and consistency to win more races with options that fit almost any class, or rules package.