Broken 440 rocker shaft, anyone else?

How far from the track do you live?
Were you beating on it on the ride home?
35 minutes away cruising at 70 mph at 3000 rpm. I was just making a shake down run at the track and planned on rechecking everything at home. I just got done putting the heads on and swapping the gear drive with a comp cams chain set. I checked the oil pump because it had some scratches so I changed it also. I also pulled the pan and checked the bearings. Everything checked good.