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Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mr. Jimmy, Feb 17, 2003.
What should be used when replacing exhaust manifold to head bolts, Grade 5 or 8?
not a whole lot of load on those bolts so grade 5 should be good.
On a matter of principal I use grade 8 when ever I can. you dont really need grade 8 but you will never worry about it if you use them and i have never broken a grade8 off in your block. and its only a few pennies diffrence in the cost. thats just my $.02
mid grade with three marks is all the factory used, you dont need anything extra than that
good luck /forums/images/graemlins/laugh.gif
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