hello Jeff,
Yes they are different. the crankshafts are different length.... I was looking in the workshop manual available on this website... Trying to copy a page over for you but it didn't work.
I have three 160 bottom ends that I have to take apart to make one good motor for next project. I just took the decompressor off and it was busted, so mower wouldn't work. It has good bore piston and rings. A good start for my new 160.
Have a look in Brissie phonebook for a mower wrecker or visit tip shops. There must be plenty around Brissie.
good luck
speedy
