Just picked up a set of -1's for my car. A good friend has several hundred passes on his Indy rockers (-1 heads) and has not had one break yet. He runs agressive roller cams and shifts in the 7k range. Never broke one yet.

My engine build is very close to his, with slightly different exhaust timing on the cam. With my luck, I didn't want to chance it. I saved up for a little while and bought Harland Sharps from Dram.

I learned my lesson back when I was running small block Fords. I destroyed 3 engines because of valve train failure.

-Dave