Poly Locks - 7/16 (4pk) PL716-4

Rocker arm nuts are critical fasteners that demand absolute security under extreme valvetrain loads and vibration. Standard nuts can loosen over time, leading to valve train damage and catastrophic engine failure. JJ-Motorsports' Poly Locks eliminate this risk with a proven polyethylene insert that locks threads permanently while remaining reusable through multiple engine builds.

Whether you're running a naturally aspirated stroker or a heavily boosted small-block, these race-proven fasteners deliver the reliability required for sustained high-RPM operation. The 7/16-20 thread pitch fits a wide range of small-block and big-block applications, making them an essential component for any serious engine builder.

• 7/16-20 thread pitch
• Polylock insert design
• Black oxide finish
• Steel construction
• Set of 4 nuts
• Reusable through multiple rebuilds
• Race-series specification