About the 351W Engine
The 351W engine, also known as the Ford Windsor engine, is a V8 engine produced by Ford Motor Company. It belongs to the Windsor engine family and was introduced in 1969 as a larger version of the 289 and 302 engines. The “351” in its name refers to its displacement of 351 cubic inches (5.8 liters). The 351W engine has been widely used in various Ford vehicles, including trucks, SUVs, and performance cars. Known for its durability and power, this engine has become a popular choice among automotive enthusiasts and is often used for performance upgrades and modifications.
351W ARP Head Bolt Torque Specifications
To ensure proper installation and secure the cylinder heads to the engine block, it is crucial to torque the head bolts correctly. The ARP (Automotive Racing Products) head bolt kit is a popular choice for high-performance applications. The following table provides the recommended torque specifications for ARP head bolts on a 351W engine:
| Stage | Torque (ft. lbs.) | Torque (Nm) |
|---|---|---|
| Stage 1 | 70 | 95 |
| Stage 2 | 90 | 122 |
| Stage 3 | 100 | 136 |
Procedure for Torquing Head Bolts
To torque the head bolts on a 351W engine, follow these steps:
1. Start by cleaning the threads of the head bolts and the bolt holes in the engine block using a suitable cleaning agent.
2. Apply a small amount of engine oil or assembly lubricant to the threads and washer face of each head bolt.
3. Install the head bolts into their respective positions on the engine block, ensuring they are properly aligned.
4. Begin the torquing process by tightening all the head bolts to the Stage 1 torque specification of 70 ft. lbs. (95 Nm) in a crisscross pattern. This pattern helps distribute the torque evenly.
5. Once all the bolts have been torqued to Stage 1, proceed to Stage 2 and torque them to 90 ft. lbs. (122 Nm) using the same crisscross pattern.
6. Finally, move on to Stage 3 and torque the head bolts to the final specification of 100 ft. lbs. (136 Nm) in the crisscross pattern.
7. Double-check all the bolts to ensure they are torqued correctly and evenly.
It is important to note that these torque specifications are specific to ARP head bolts. If you are using a different brand or type of head bolts, refer to the manufacturer’s instructions for the appropriate torque values.
Conclusion
Properly torquing the head bolts is essential for maintaining the integrity and performance of the 351W engine. By following the recommended torque specifications and using high-quality head bolts like those from ARP, you can ensure a secure and reliable connection between the cylinder heads and the engine block. Remember to always consult the manufacturer’s instructions and take necessary precautions to achieve accurate torque values. With the right techniques and attention to detail, you can successfully complete this crucial step in the assembly or maintenance of your 351W engine.