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 - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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