I cant seem to find a supplier of grade 10.9 for the
12mmx1.5

Assuming the engine has 4 mount points, the 2 stock
mount pads, each with 3-12mm bolts and 2 additional
mount pads.    

Focusing on the 2 stock mount pads...

Will having grade 8.8 for the 6 bolts make a
substantive difference?

Thx...
-Scott


 
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