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Could be. But you would think the other throws would also have some removed. I still question it but if a competent crank grinder checked it out and said it was good to go I would run it.
It obviously triggered a concern from the crank grinder. It does not look like any of the other throws that I can see. It might be ok but I would question it.
The LSA you can not change its the way the cam is ground. The ICL you can change when degreeing a cam. What as the recommended cam degree and what did you degree it at?
Most adjuster screws are 3/8 fine thread. So 1 turn from zero lash is about .042 preload and that is about what most company's want. Pretty sure Comp recommends .040 preload. I set most all to that spec unless the cam and lifter company says different...
Not sure. As I recall the FSM was more concerned about spring height. I suppose if you have the correct spring height without shims you could measure the valve and use that for a reference.
They quit using them for a reason. They were not needed. Small blocks as well as big blocks used them. If not using them caused leaks then all motors built with out them should of leaked. They did not. So run it or leave it out its your choice.