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23 Buick head replacement?

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You shouldn't need new bolts but if any feel "soft" when torqueing, replace it.   I assume new head gasket.  so torque in stages, in a "circle" starting in the center and working outward to the ends. 

Maybe 30 ft lbs the first round, then 40, then finish at 45. after a week or so redo them.  45 ft lbs should be enough.  

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You want bolts that will stretch within their tensile yield point under torque.  High tensile strength bolts require higher torque.  Think of the bolts as springs to keep the head held in place under heat and cool cycles.  Excess torque will distort the head and possibly the threads on your 100 year old parts. 


Bob Engle

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