What are the header bolt torque specs for 1997 Chevrolet Astro Van?

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I have a 79 Chevy K10, wondering about tire size.?

Exhaust Manifold Torque
1st - 11 ft./lbs.
2nd - 22 ft./lbs.

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If you are referring to the actual cylinder head bolt torque it is as follows the first number is in Nm. the second is in Foot pounds

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Cylinder Head Bolt (Preferred Method)

All Bolts First Pass in Sequence
30Nm
22Ft Lb
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Long Bolts Final Pass in Sequence
75 degrees

Medium Bolts Final Pass in Sequence
65 degrees

Short Bolts Final Pass in Sequence
55 degrees

Cylinder Head Bolt (Optional On-Vehicle Strategy)

First Pass in Sequence
34Nm
25Ft Lb
--

Second Pass in Sequence
61Nm
45Ft Lb
--

Final Pass in Sequence
90Nm
66Ft Lb
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