I remember installing the pistons in this engine (Continental F-162): I did not have to drive them in or anything like that, but there was significant friction which obviously came from the rings. The oil rings are the type which use an upper and lower thin ring with an expander behind. They are designed to wear in very quickly. I checked the end gap of each individual ring in the bore where they were installed, but as I recall there is no end gap on these oil rings. In short: I am not surprised at the amount of friction in this engine, given my experience installing the pistons.I've barred it around probably 25-30 revolutions, timing the magneto, etc. It has compression in each cylinder, and it does not have any particular tight spots. The block was bored and honed, and the crank was inspected and polished, in a professional shop long in business and of high repute. Since I can't tow-start a Lincoln welding machine, I wonder how I'll ever get it started.
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