STILLEN 2003-2006 Nissan 350Z [Z33] / 2003-2008 Infiniti FX35, G35 Underdrive Pulley Belt Set - 400336B

The STILLEN Underdrive Pulley Belt Set is a required installation component for vehicles equipped with STILLEN underdrive crank pulleys part numbers 400336 and 400345. When an underdrive pulley is installed, the factory-length serpentine belt is no longer compatible due to the reduced pulley diameter. This belt set ensures correct belt length, proper tension, and reliable accessory operation.

Designed specifically for STILLEN pulley applications, this belt set eliminates guesswork and prevents issues such as belt slip, improper tension, or premature wear. Using the correct belt is essential to maintaining accessory performance and long-term drivetrain reliability after installing an underdrive crank pulley.

This belt set provides a direct-fit solution for Nissan and Infiniti VQ-powered vehicles and is intended exclusively for use with STILLEN underdrive pulley systems.

Fitment:

• 2003–2006 Nissan 350Z [Z33]
• 2003–2008 Infiniti FX35
• 2003–2008 Infiniti G35
• Required for use with STILLEN Underdrive Crank Pulley part numbers 400336 and 400345

Key Features:

• Underdrive pulley belt set
• Engineered specifically for STILLEN pulleys
• Correct belt length for reduced-diameter crank pulleys
• Ensures proper belt tension and accessory operation
• Required component for underdrive pulley installation
• Direct-fit replacement solution

Installation Notes:

• Designed exclusively for STILLEN underdrive crank pulleys 400336 and 400345
• Factory serpentine belt will not fit underdrive pulley applications

Technical Details:

• Application: Underdrive crank pulley systems
• Compatible Pulley Part Numbers: 400336, 400345
• Part Number: 400336B
• Manufacturer: STILLEN