To get a 123 up to a 135 also requires a change in crankshaft.
Standard bore for a 123 is 3.125". Oversize pistons and sleeves are 3.25, the same as the C135. However, the C135 also uses a crankshaft with a stroke of 4.0625 versus the 4.000 used in the 113 and 123 engines. Using the 3.250 pistons and the 4.00 crankshaft leaves you with a 132 engine.
There is also a C146 engine that was not used very much. It is basically a C153 block with a C135 crankshaft.
Bore and stroke for all the engines in this family are as follows:
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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