Many thanks to the community here!

I'm going to replace my timing chain on my 1982 Mercedes 300SD (126) this coming weekend. Since I'm going to have the valve cover off, I thought it would be a good thing to retorque the head bolts.

Thanks for the tightening sequence - but now I'm confused which head bolts I have!

I see two type of bolts listed on the tightening sequence

1. Hex Socket head bolts (cylinder head bolts with cylindrical shank)
2. Double Hex socket cylinder head bolts (necked down cylinder head bolts)

I believe my engine's a 617.951 - both bolt types call for different torque procedures. Which one do I use?

Best regards,

James F. Smith