Grade 8 bolts were only used on the engine head of these machines best i remember. That said you can use them but like someone else posted i would only torque them to the grade 5 spec it may not sound like a lot torque but it will hold and its alot of work replacing a cracked housing! Been there done that.
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1782 smoker!!, 169 and parts 128
And a bunch of stuff that fits on the back of them LOL
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