Economists can't multiply complex numbers.. ;-) 88s are machine - ins. Traditional "wisdom" was that 88s run cooler than 87.5s because of the thicker walls of the cylinders. 90.5s basically buy you the same thickness in cylinder wall. Why didn't they do it? Only Denis' hairdresser knows for sure. If the sizes are as Denis says, it's a 1907, not a 1914. Actually the guys who say they have a 1914 have a 1915... You may have also seen out there that AAA pistons has a 92mm piston/cylinder set that uses the same machining as 94s. This means you can run 92s with the same thick wall cylinders as 90.5s..
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