While continuing into my air compressor saga, I attempted to replace the cam and crank sensors since I already had the compressor out. What a fiasco. The lower crank sensor broke off flush with the block. Believe me, I tried to finesse it out, but not happening. It broke off flush. That started my 8 hour fix. I manage to drill a hole in it and insert a screw, which pulled the threads right out. Then I drilled a larger hole for a larger screw, that failed, as it broke off even deeper, about 1/8" below flush. Then I managed to drill a larger hole so that I could install a 5/16" lag screw, which finally worked (I ground off the tip for deeper embedment), but I had to make a custom "puller" out of some spare parts in the shop. It was a tough pull, especially with everything in the way. However, after about 8 hours, I managed to get it out. It was tough all the way to the end. It didn't help that the large bolt only managed to expand the sensor making it all the tighter. However, I managed to get it out, and I'll be using some grease on the new one before inserting them. The upper cam sensor wasn't much of a problem. I noticed that my new sensors are made in China, so I'll be ordering some OEM units, if they are available. After all that work, I want some good quality units to reinstall.