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I've traced a leak in my Model A engine to a small hole in the block at the bottom of the threads where # 7 head stud goes. The threads appear to be solid. I need to seal these threads to eliminate the leak but not permanently affix the stud so it can't be removed when the need arises. What...

I have about 5000 trouble free miles on a rebuilt standard Model A engine. Recently on tour the engine lost power but continued to run. Compression on warm engine is near 70# on front and rear cylinders but less than 50# on the two in the middle. Removed head, the gasket did not appear to be...