A very good picture.
I was forced immediately to try an import into Fusion360.
The scale I have used is pure fantasy, because I am sure the conrod is longer than 103 mm.
My scale was based to a connrod bearing diameter of 35 mm in this picture so the rest was scaled in accordance to this.
It is 30 or more years ago, that I have seen a disassembled Lycoming engine last time.
Never the less, I am always impressed by the easy way to get a picture into Fusion360, put a sketch on it and starting the (re)construction.
And yes, just seen I have chosen the inner diameter of the gudgeon pin and not the outer, but anyway I am playing around only.