OK so I went with a friend to look at a 47 Pan that was for sale. I told my friend that there was no 47 Pan but went to look any way. What I saw was a Pan right side case mated to a Knuck left side case. Closer look showed a weld repair just under the number boss from the front cylinder to the rear. Numbers looked OK but they could have been cut off with this repair. But what really got me thinking was that the Pan cylinders sat just like they do on my Knuck. sticking over the case to the primary. This was a runner and no oil leaks but how did the oil drain from the heads? The rest of the bike was a mix and match with an inline springer and right side mounted tool box. Passed on the bike just too much wrong with it. Including the cases. But I have never heard of matching a right side Pan to a left side Knuck. Can it be done? Early Pan case is not too much different than a Knuck except for the big thick casting on the left and all new timing case on the right. But still, why would any one do this? Not too sure where to post so I put it here in the Pan section. It is a Pan now. I guess.