Yeah, but some folks (like me) like the look of the acorn nut. Just seems a little more "polished" to me. No pun intended.
After reading these posts, I removed one of them and measured the protruding length of the bolt and compared it to the depth of the nut+washer. Bearing in mind the inconsistencies in the hardware from the factory, I got inconsistent measurements at all four locations. Some with room to spare and some with none.
Rather than deal with bolt removal, I grabbed a file and took a few thousands of the long ones and re-installed the acorns.
I did
not use the published torques. Snugged them up and 1/3 turn (or less) to tighten. No problems.
In all fairness, I've been a mechanic for over 25 years so I have a good feel for when to stop tightening, so some advice for the guys just jumping into mechanics:
DO NOT use the RE-published Torque values in the Service Manual or the NFG catalog unless you have double-checked them with folks here in the forums!
(When I read 20 ft/lbs for the spark plug I just shook my head.)
But you know, doing it right is half the fun!