xs360 case screws

venicedan

"get busy living or get busy dying" sr
so i bought a new to me xs360 a few weeks ago from an 87 year old man that has owned the bike since 1984. the bike has 3000 original miles on it, so it really hasnt been riden much at all. so the weird thing is, all the engine bolts are socket head cap screws (i think im saying that right) i know the gentleman that owned it didnt put them in because he put it in storage shortly after he bought it. so is this something they put in when they were fairly new as an upgrade or did it come stock that way. stumped here. ive put them in on engines ive worked on in the past, but ive never seen them put in from the 70's
 
They are stock on a lot of Yamaha's from late 70's, all my 650's have them
 
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