Hi Bryan, I would expect you will have vibration on a 290 or 304, due to the different weight of the pistons. As for a 360, I'm less certain... The bore is the same, just the stroke is different. If the 360 pistons are the same weight as the 343, you might get away with it. That being said, I'm a strong believer it taking the whole mess into a decent machine shop and getting them to balance it. Then you know for sure, BEFORE you've got the engine in the car! Cheers, Dave Message: 2 From: teamamc <teamamc@xxxxxxxxxxx> I am buying a 1968 T10 4speed. From a javelin. What are the differences between the 1968 and the 1973 4speed. Comes with a 343 fly wheel. Will I run into vibration problems with if I install on a 290 or a 360 Thanks Bryan _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list