Hypereutectic pistons and failures related..

My 360 has Speed Pro hypers in it, they say to use normal end gap spec's for their pistons. This thing sees 7500 RPM on a regular basis with 12.7 compression. I had to cut the valve reliefs way deeper too, in fact it's so deep that the piston top is only .090 thick where the exhaust valve relief is. Been running like this for over 10 years now without a problem.