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What is different about the MSD dist that it won't fit? I have been using a 440 dist in my 383 for 25 years and was thinking about upgrading to an MSD. now I'm confused....



The MSD distributor has a bearing in the housing at both ends of the shaft so it is larger , all you need to do is have the ID of the adapter opened up , 10 mins on a lathe , if that long .



That is correct. While it's on the lathe have it cut for a O ring also so it seals. Thanks to HEMI Joel for turning mine down.