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Bolt specs can change mfg to mfg due to alloy differences and other things, but the overall trend for a bolt strength is seen. Here is a chart from Allied Bolt showing the comparison between "Sheer Strength" and Tensile Strength". For you guys that like to use a chain strung across the intake...
I use them all the time. The max tensile strength on a grade 8 5/16"-18 bolt is 7850lb times the stress area in in^2 is 7850*0.0524= 411.34 lbs.
Approximate a 800lb motor /4 = 200lbs per bolt. You are only at half of the allowable load on each bolt and honestly, most motors are less than...