[farmdreamer]

Thank you for the replies. I didn’t know what was behind the hydrostat adapters on the flywheels, so I took them off yesterday. The cast center of the hydrostat adapters have balance drill holes in both of them, but I assume that is for the coupler itself.

The 401 has a 6 bolt flywheel, the toroflow has an 8 bolt. I didn’t take the flywheels off yet. I assume if there was any balancing work on them to match the engine, it would be on the back side, so I can’t tell for sure yet. Attached are some pictures in case anyone else gets curious about uni engines as well.

As much as I’d like to use the diesel, it sounds like the 401 would be a pretty easy swap if I buy that stuck 305 for the bellhousing/ flywheel/ clutch assembly.

Another question, you referred to the 401 as a 401M. I don’t have an M stamped on my block. Were all 401 engines magnums, and they just didn’t stamp them?