The specs for the original B&M O69J probally varied depending on which motor is was built for,Hemi,Wedge, SB, if it was a custom built converter I have driven them on the street I have a SS T/A 8 inch race Hemi converter in my Duster now and it drives fine on ths street and works a lot better at the track than my custom built 10 inch street and strip converter did