Masonry hammer drill would be my second choice, you just have to be careful once you penetrate into the block cell, you could hit a cell wall too, you will know quickly, masonry bits punch through block or concrete masonry units (CMU) very easily unless its high strength cmu.
Not too long ago I had to re-route a sump pump discharge line for my neighbor, through a hollow CMU foundation wall, a good friend who is a hvac/plumber, had a core bit set in his truck, I borrowed that and over sized the hole for a pvc sleeve and sent the sump discharge line through that, core bits do provide a neater hole, the masonry hammer bit could fracture or spall the opposite side, either will work, one may require a little patching. For larger holes, in CMU or concrete core bits are commonly used.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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