All the case studs are in the left side of the motor. I just realize after putting the case back together (no nuts, just testing) that 1 of the 6 major studs that do all the WORK to keep the case halves together was to short to get a nut on it and one other was almost to long and all the threads were exposed outside of the hole in the case.
So, I took the other case half off and removed those 2 major studs. These often will come out of the block when you go to take the large 17mm nut off to split the case. The nut stays on the stud and your impact gun removed the entire stud from the other half of the case. Pretty common.
So, I took these two out and the were different lengths for sure, about 3/8 of an inch different.
I guess you could use lock tight on these, but when I swapped them around they seemed to go in tight and were the proper length. Make sure to clean the hole out with compressed air and a Q-tip and vacuum. This is 40 year old aluminum, it gets soft. DON'T crank down on the stud when installing, you will strip the threads out. Use 2 or 3 17mm nuts tightened together on each other to hold the stud when you are taking them out or putting them back in. To get one of the studs out I had to use 3 nuts Plus a big pair of vise grips on the stud to grab it enough to remove, they are Really in there and have good reason to be. They hold the crank shaft and cam shaft in place and keep the case half's from moving apart.
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