Yes i was looking at them but the fact that they recommend cyro treatment when going as big a cam and springs that i may use gives me pause. I have used harlan sharps for years with no problems. With the new cnc victor heads that we are developing they flow well up to and over .800 lift at over 400 cfm. the other alternatives seem to be jesel or t&d. looking for used sets to experiment with rather than buying several new sets. thanks paul