EQ Magnum heads

Anybody use EQ Magnum heads? A stock car customer on my route has them on the 360 in his Modified car. Since the install with a larger cam he has been mopping up at the track. (last year points winner at one track and runner up at another) They are advertised as replacements for oem use and have been redesigned to prevent cracking which is a problem with the stock heads. Just curious.