As long as were are ONLY stating facts. Let's look at this a little different. So what if new lifters had been used and had a manufacturing defect. Or let's say the used lifters were defective and not defective due to 50 laps of use but due to a manufacturing error. As a result the defects caused the failure. The OP has not ruled out lifter problems but BELIEVES that the failure is only due to the spring selection causing surge. There is no evidence provided by the OP that he has ruled out a defective lifter. It is totally his belief.

At this point he has no proof only a theory but has chosen to publicly bash the company that built the motor when in fact they may have nothing to do with the unfortunate circumstances.

Question: What was so wrong with the previous race engine valve train that they needed to immediately change to a Jesel setup? Did this have an impact on the lifters?

Damon