[BossHogg69]

Originally Posted by James the III

What heads?? and did you use the correct locks and retainers..
I.E. 10 * retainers with 7* locks..
why it drop a valve??
or did it drop it from valve float.. or coil bind..

Heads are Edelbrock RPM Marine ovals as described in the previous posts. 10* Crower locks & retainers, #87055. Springs were Crower #68363. If if was the wrong retainers, I would think the whole valve (stem and all) would have been in the chamber, not just the head of the valve. Retainers were still intact as shown in the pics. I ordered everything from Crower after talking to them about what heads & cam I was running. Crower SS Enduro rockers. Pushrod length was measured during assembly and ordered accordingly. I'm very confident it was not coil bind, and unlikely that it was valve float, as I'd spun the motor up higher than the rpm that the valve failed and never gotten any indication of valve float. Not to mention both Crower and the guy that did the cam (Chris Straub @ Straub Technologies) said the springs were right for my the cam and set up accordingly. I think given where the valve broke, it was fatigue or maybe the seat wasn't perfect and caused it to fatigue somehow? I really don't have a 100% sure answer, as I am just a shadetree hack at best - which is why I posted everything up to get some opinions. The head itself and the valves were not new (they came off another engine), but all the other hardware was.