On a stock engine the # 3-4 cylinders should be exactly 90* off from the # 1-2 cylinders. When veiwed from the recoil end of the crank with the # 1 cylinder's rod pin at 12:00 # 2 will be at 6:00, # 3 will be at 3:00 and # 4 will be at 9:00. On the 180'd engines I have seen 1 and 4 will run together and 2-3 will do the same. I guess they can also be set to run 1-3 and 2-4 together in 180'd configuration but I havn't seen any done that way. This is not something that should be done by someone that isn't qualified and doesn't have the proper equipment. This is a job for a GOOD!! crankshop to do.
opsled