In case you've ever wondered, "What is the difference between a bolt and a screw?", here's the answer, courtesy of Machinery's Handbook, Twenty-First Edition, Page 1131:
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"Differentiation between Bolt and Screw. --
A bolt is an externally threaded fastener designed for insertion through holes in assembled parts, and is normally intended to be tightened or released by torquing a nut.
A screw is an externally threaded fastener capable of being inserted into holes in assembled parts, of mating with a preformed internal thread or forming its own thread and of being tightened or released by torquing the head."
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So, by that, all the fasteners holding this cylinder head in place are screws, not bolts.
And the two fasteners holding this pulley together are bolts, not screws.
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