I don't know if I should be posting this in the 5.0 forum or here but, basically I'm putting a late model 5.0 in my 69' mustang. I've had to get a few new items to make everything work properly, one of them being a new hamonic balancer since the one from the orginal motor was a 28oz and the late model 5.0's are a 50oz. Well anyways, a buddy of mine informed me today that I can't use the orginal flywheel from the my orginal motor because of the whole balance issue. is that true?

 

Yes

 

LOL damn!