loose in the lifters

[alchemy]

The new Tardel-Bishop book recommends clamping the bolt lengthwise in a vise, and giving it a squeeze to "shorten" that necked down area of the bolt a bit. But if the end of the bolt is sticking too far down into the body, you will get the problem you have.

I think those lifters must have been made for reground cams, with smaller lobes.

I'd think it wouldn't hurt one bit to give the loose ones a super-cleaning before assembly and drop some Loctite into those threads after adjusting.