SOURCE: head bolt torque
They have this listed under a 2007 E-350 but I new it couldn't be. Any how the torque specs are as follows. The big bolts 1-26 are to be torqued first they are torqued to 120 ft. lbs. then rechecked to 120 ft. lbs. Then tightened 1/4 turn or 90 degrees. After that that loosen all the bolts up till the washers are loose again then perform the exact sequence all over again. After that tighten the small bolts on the outside part of the cylinder head all 7 of them to 20 ft. lbs. Good luck.
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