quote:Originally posted by Push1267: I have a vibration issue with my 427 winsor stroker. It vibrates quite a lot all through the rpm range. Although the crank, balancer and flywheel balance should match (see below), I suspect (fear) that it’s crank imbalance. Could it be something else? Kristian
Kristian, there's an outside chance the reciprocating assembly and flywheel are just fine and the clutch/pressure plate mounting is slightly off. Depends upon how well it was centered during mounting or I suppose slight differences in mounting hole patterns on the flywheel though I would doubt the latter as it is pretty basic for such a manufacturer such as Fidanza.
Was it difficult to mount the transaxle? It is not at all uncommon for the bellhousing dowells to be off. Offset dowels are made, though the symptom here is usually difficulty assembly and possible pilot bearing failure though it also imparts a lot of stress to the input shaft. Can you discern difference in severity of the vibration when clutch is/isnt engaged? Even though the pressure plate is always attached to the flywheel, slight diffrerences in centerline of pressure plate mounting thus clutch/input shaft to the flywheel can cause chatter upon clutch engagement and vibration under power.
-Just a thought.
K