About the 351W Engine
The 351W engine, also known as the Ford Windsor engine, is a popular V8 engine produced by Ford Motor Company. It belongs to the Windsor engine family, which includes various displacement sizes. The 351W engine was introduced in 1969 and was widely used in Ford vehicles until 1996. It is known for its durability, performance, and versatility, making it a favorite among automotive enthusiasts and professionals alike.
351W ARP Head Bolt Torque Specs
When it comes to assembling the cylinder heads on a 351W engine, it is crucial to follow the recommended torque specifications to ensure proper sealing and prevent any issues down the line. The ARP (Automotive Racing Products) head bolt torque specs provide the necessary guidelines for tightening the head bolts to the correct specifications. Here are the ARP head bolt torque specs for the 351W engine:
| Tightening Sequence | Torque Specifications (ft. lbs.) | Torque Specifications (Nm) |
|---|---|---|
| 1 | 70 | 95 |
| 2 | 100 | 135 |
| 3 | 100 | 135 |
| 4 | 100 | 135 |
| 5 | 80 | 108 |
| 6 | 60 | 81 |
| 7 | 40 | 54 |
| 8 | 30 | 41 |
Tightening Sequence
It is essential to follow the correct tightening sequence when torquing the head bolts on a 351W engine. The tightening sequence ensures even distribution of the clamping force, minimizing the risk of warping the cylinder heads. The sequence typically involves tightening the bolts in a specific pattern, starting from the center and working outward in a crisscross pattern.
Torque Specifications
The torque specifications provided by ARP for the 351W head bolts are measured in both foot-pounds (ft. lbs.) and Newton-meters (Nm). It is crucial to use a torque wrench calibrated in the appropriate unit to achieve the recommended torque values accurately. Over-tightening or under-tightening the head bolts can lead to head gasket failure or other issues.
Proper Torque Procedure
To ensure the correct torque is applied to the head bolts, follow these steps:
1. Clean the threads of the head bolts and the bolt holes in the engine block.
2. Apply a small amount of engine oil or ARP Ultra-Torque lubricant to the threads and the underside of the bolt heads.
3. Start by tightening all the bolts to 30 ft. lbs. (41 Nm) in the specified sequence.
4. Repeat the tightening process, increasing the torque to 60 ft. lbs. (81 Nm) in the specified sequence.
5. Finally, tighten all the bolts to their specified torque values in the recommended sequence, following the table provided.
By following the correct torque specifications and tightening sequence, you can ensure the cylinder heads are properly secured, promoting optimal engine performance and reliability. Always refer to the manufacturer’s guidelines or consult a professional if you have any doubts or questions during the assembly process of your 351W engine.