I've been informed that it's 90-120 inch pounds. I'm trying to find a second source to confirm. Might even just call to part stores and see if they have the specs.
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Intake manifold torque specifications for the Olds 403 is listed as 30 ft-lbs.
On a cast iron intake the torque is 30 lb/ft.
Bstuff.com should have the info you are looking for.
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The torque specifications, for a 4.3 liter engine manifold, is 45 pounds per square inch. Torque the manifold bolts in 15 pound intervals.
The 1997 Buick LeSabre intake manifold bolt torque specifications is 45 pounds per square inch. The manifold bolts should be torqued in 15 pound intervals.
the haynes book states 89 in pounds
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