I read the sticky post above on engine imbalance but need further info please!
Have a 1979 351W and a C6 in our '54 Ford wagon. Engine has the original front pulley/dampner and I replaced the flexplate but cannot remember comparing the original to the new one..
Flywheel has a fairly large weight on it.
Have a shake in the motor as I start to pick up RPMs, especially at lower and mid range. Seems to dissapate at highway speeds.
Did I use the wrong flexplate??? Help

Just viewed some history threads. THis 1979 motor came from an E150 Van. It looks like it has a 50oz vibration dampner on it which
was the original one I removed. This seems contradictory to other posts. ?????

 

All 351W should have a 28oz flexplate/flywheel, and dampner.

 

Correction: just got a way better look at the dampner..it is a 28 Oz.

 

Hey fellas, I think I have a handle on it after I read all (!) the many
posts and threads on this extensive subject. Whew, my eyes are tired !

AM quite sure have a 50 oz plate mixed with an early 28oz damper
Will get at 'er next week to check for sure.