In my 86-96 aerostar repair manual it says to use new bolts , tighten the bolts over a 3 step sequence to the torque required. Here is the sequence
5 1 3 7
6 4 2 8
Torque specs
Step 1 44lbs step 2 tighten intake mainifold to 36 -72 in lbs step 3 59lbs step 4 tighten intake manifold to 72 to 132lbs in-lbs step 5 turn cylinder head bolts an additional 80 to 85 degrees
step 5 complet intake mailfold torque steps 3 and 4
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