The 96 engines all start with a nasty bang due to the crummy design of the compensator.. If this is what you were hearing, there's not much can be done about it other than upgrading to the newer compensator assy.
Compensator Kit - Harley Davidson Community
Thanks Glider for the link on the compensator issue. I guess that's one more thing to add to my ever increasing list of things to do as I modify my build. By the way I was hoping to hear from you on my 103 post regarding head work.
I appreciate your input.