INSTALLATION STEPS
1.
The first thing you need to do when you get the bolts is to measure them, so you are sure you have the correct size.
Please note that many bolts may look alike but have differences.
After you have measured the bolts, you must clean the threads of the rods and bolts very well.
2.
Next, always apply ARP moly lube on the threads and under the head of the bolts before torqueing.
3.
Install rods by positioning cap and beam into alignment.
Each rod is numbered and MUST be assembled with the same number on the cap and beam.
4.
Sequentially torque bolts to specified torque, NOT exceeding the specified values on the table below.
Rod Torque / Stretch Specifications
| Material | Thread Size (in.) | UHL* (in.) | Recommended Bolt Stretch (in.) | Recommended Torque w/ ARP Lube (ft/lb) |
|---|---|---|---|---|
| ARP 2000 | 5/16 | 1.500 | .0055" - .0060" | 30 |
| ARP 2000 | 3/8 | 1.500 | .0050" - .0055" | 45 |
| ARP 2000 | 3/8 | 1.600 | .0062" - .0065" | 45 |
| ARP 8740 | 7/16 | 1.600 | .0050" - .0055" | 65 |
| ARP L19* | 3/8 | 1.500 | .0060" - .0065" | 50 |
L19 Material
L19 material is easily contaminated and subject to stress corrosion.
It must be kept well-oiled and not exposed to moisture.
UHL
UHL means "Under Head Length".
The distance as measured from the tip of the fastener to the place directly at the base of the head.
ARP Lube
We recommend only using the supplied ARP Ultra Torque Fastener Assembly Lube.
ARP lube reduces friction about 25–30% in comparison to engine oil.
The above-mentioned values are valid only if the thread and seat area of the bolt has been lubed properly.
Important Bolt Inspection
If any of the bolts have taken a permanent set and have stretched by .001" (0.02mm) or longer, you should replace the bolts IMMEDIATELY.
Critical Clearance Guide
Connecting Rod Bearing to Crankshaft Clearance
- Minimum: .002" (0.05mm)
- Maximum: .003" (0.07mm)
The measurement should be vertical.
Wrist Pin Clearance
Recommended wrist pin clearance:
- Minimum: .0008" (0.02mm)
- Maximum: .0015" (0.04mm)
In some cases, depending on the wrist pin diameter, the rods may require resizing at the time of installation.
Side Clearance
- Minimum: .015" (0.38mm)
- Maximum: .025" (0.63mm)
Engine Block to Connecting Rod & Crankshaft Clearance
The clearance between the engine block and the connecting rods and crankshaft should be:
.061" (1.54mm) minimum
Important Note
If for some reason you want to balance the connecting rods, it is not recommended to remove material from the connecting rod cap.