What is the proper big block Chevy head bolt torque sequence?

The proper torque specifications and sequence may vary depending on factors like the specific big block Chevy engine model and year. However, here is a common torque sequence followed for big block Chevy engines:

1. Begin with the center head bolts. Install them first and tighten to the specified torque. Refer to your particular engine manual for the torque requirement, as it can vary.

2. Next, tighten the two head bolts located to the right and left of the center bolts. Again, follow the specified torque from the engine manual.

3. Continue with the remaining head bolts, tightening the ones to the left of the center bolts before doing those on the right. Work in an alternating left-right pattern.

4. Make sure to tighten the head bolts in several stages, gradually reaching the final recommended torque. This helps to ensure even distribution of the load and prevent potential damage to the head or head gasket.

5. Complete the tightening process by re-checking and tightening any bolts if needed to ensure they reach the specified torque.

Remember to always consult the engine manual for your specific big block Chevy engine model for the exact torque specifications and any any additional details or considerations related to head bolt tightening.