I want to clarify what I mean by the step on the bolt. When you clamp down those bolts you deform the ends and you cannot get them back out of the hole if you need to. The threads are deformed and too large. Therefore, if you put the bolt in a lathe and turn 2 threads or so down to the root diameter, essentially creating a step, you deform the end but don't expand threads (you have clearance now) and you can therefore get the bolt back out of the hole. If you don't have a lathe a grinder can be used in a pinch if you are careful
The jam nut is needed because no matter how hard you clamp those bolts down the vibration and banging will loosen them and you'll have to retighten every round. Learned this the hard way.
A 2" bolt is long enough. Actually about as long as you can use on the hole closest to the block / oil pan.
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