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Not really, since the tensile stress in the fastenner has to be held equally by both ends of the fastenner. A bolt head simply holds the force by its contact with the pump, whereas a stud will send the same force through threads, to the nut, and to the pump behaving in the same manner as the bolt head. I believe one of the advantage of studs is that you are not initiating heavy metal to metal sliding load in the soft aluminum block threads as you torque the nut. I am not sure of other reasons, but I'm sure there are more reasons to use studs versus long bolts.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky
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