My wife's dad past away and left us his 2009 300, 3.5L. It has a blow head gasket, I've already got heads and cleaned everything up ect. I've done head jobs before. I'm pretty mechanicly inclined. But I can't for the life of me find the proper torque specs for the head bolts! I found some for the original 3.5 from the 90s apparently, (there went a set of head bolts down the drain.) Can anyone here help me? It's a very nice car.

 

Get yourself a copy of Haynes Manual # 25027

 

the torque setting is 90ftlb rising to 100 once all bolts are set at 90 ftlb I run one of these myself amazing cars when they run well mine is lpg gas converted to save me fuel money well worth it watch this video mate
https://youtu.be/Ua0AHGnqRyA

 

The 8 main/large 3.5l head bolts are torque-to-yield. They are all first torqued to 35 ftlbs in sequence, then to 55 ftlbs in sequence. The last step is an additional 90 degree turn in sequence. The last step is not by torque but by 1/4 turn. The 3 smaller bolts are 20 ftlbs.