That was the problem. The valve train itself wasn't exactly a precision setup by any means, specially when you consider that OHC is suppose. to an RPM benefit. It wasn't with the SOHC. Valves were too heavy. The OHC added nothing to the performance of the FE. All the additional performance came from the combustion chamber, not the camshaft location. And only the chamber was really on nitro. It added very little on gas, and what it did add was over shadowed by reliability. There is a reason Ford didn't use it at LeMans. You can't win if you don't finish. A concept Bruce struggles with. Its why he is such a GN24 fan. A blistering 5 laps in a 20 lap race, with the rods hanging out is more impressive to Bruce than a actual win.