About the 350 Chevy Engine
The 350 Chevy engine, also known as the Chevrolet Small-Block V8, is a popular and versatile engine that has been used in a wide range of vehicles since its introduction in 1955. It is known for its durability, performance, and ease of modification, making it a favorite among car enthusiasts and hot rodders. The 350 Chevy engine has a displacement of 5.7 liters and has undergone several updates and improvements over the years to enhance its power and efficiency.
Head Bolt Torque Sequence for the 350 Chevy
When assembling or reassembling the cylinder heads on a 350 Chevy engine, it is crucial to follow the correct torque sequence to ensure proper tightening and prevent any leaks or damage. The head bolt torque sequence is a specific pattern in which the bolts should be tightened to distribute the clamping force evenly across the cylinder head gasket. Here is the recommended torque sequence for the head bolts:
| Bolt Number | Torque Specification (ft. lbs.) | Torque Specification (Nm) |
|---|---|---|
| 1 | 25 | 34 |
| 2 | 45 | 61 |
| 3 | 45 | 61 |
| 4 | 25 | 34 |
| 5 | 65 | 88 |
| 6 | 65 | 88 |
| 7 | 45 | 61 |
| 8 | 45 | 61 |
Tightening Procedure
To properly torque the head bolts on a 350 Chevy engine, follow these steps:
1. Begin by tightening all the bolts to 25 ft. lbs. (34 Nm) in the numerical order specified in the torque sequence table.
2. Next, repeat the process and torque all the bolts to 45 ft. lbs. (61 Nm) in the same numerical order.
3. Then, increase the torque to 65 ft. lbs. (88 Nm) for bolts 5 and 6 in the sequence.
4. Finally, complete the process by torquing bolts 7 and 8 to 45 ft. lbs. (61 Nm).
By following this torque sequence and procedure, you will ensure that the cylinder heads are properly tightened and sealed, providing optimal performance and reliability for your 350 Chevy engine.
Final Thoughts
The 350 Chevy engine is a legendary powerplant that has stood the test of time. When working on the cylinder heads of this engine, it is crucial to follow the correct torque sequence and specifications to ensure a proper seal and prevent any issues down the road. By using the recommended torque values and tightening procedure outlined in this article, you can confidently assemble or reassemble the cylinder heads of your 350 Chevy engine and enjoy its performance for years to come.