ARP 2000 rod bolts are high-performance fasteners commonly used in engine builds. Proper torquing of these bolts is crucial for engine reliability and performance. This guide will cover the recommended torque specifications and best practices for installing ARP 2000 rod bolts.

Torque Specifications

The recommended torque spec for ARP 2000 rod bolts varies slightly depending on the exact application, but generally falls within this range:

  • 3/8" ARP 2000 rod bolts: 45-50 ft-lbs
  • 7/16" ARP 2000 rod bolts: 70-75 ft-lbs

It's important to note that these values are for use with ARP Ultra-Torque fastener assembly lubricant. Using a different lubricant may require adjusting the torque spec.

Bolt Stretch

While torque is commonly used, bolt stretch is actually the most accurate way to achieve proper preload. ARP recommends the following stretch ranges:

  • 3/8" ARP 2000 rod bolts: 0.0055" - 0.0060"
  • 7/16" ARP 2000 rod bolts: 0.0062" - 0.0067"

Using a stretch gauge is highly recommended for critical applications to ensure proper bolt preload.

Installation Procedure

Follow these steps for proper installation of ARP 2000 rod bolts:

1. Clean and inspect all threads carefully

2. Apply ARP Ultra-Torque lubricant to threads and under-head area

3. Thread nuts onto bolts by hand

4. Tighten to approximately 20 ft-lbs

5. Final tighten to recommended torque spec or stretch value

6. If using torque method, repeat final tightening process 2-3 times

Important Notes

  • Always use new ARP rod bolts when rebuilding an engine
  • Never reuse rod bolts that have been previously torqued
  • Verify your torque wrench calibration before use
  • Consider using a digital torque adapter for improved accuracy

Torque Sequence

When tightening connecting rod bolts, follow this sequence:

1. Tighten both bolts on one rod to 20 ft-lbs

2. Final tighten both bolts to spec

3. Move to the next rod and repeat

4. Complete all rods in this manner

This helps ensure even loading across all rod bolts.

FAQs About ARP 2000 Rod Bolts

    • Can I reuse ARP 2000 rod bolts?
      No, ARP recommends against reusing rod bolts. Always install new bolts during engine assembly.
    • Do I need to use ARP Ultra-Torque lubricant?
      While not strictly required, using ARP's recommended lubricant ensures you achieve the correct preload at the specified torque value.
    • Is a stretch gauge necessary?
      For critical high-performance applications, a stretch gauge is highly recommended for the most accurate bolt preload.

By following these torque specifications and installation procedures, you'll ensure your ARP 2000 rod bolts are properly installed for maximum engine reliability and performance.