I have one of his heads on my pump, but I rebuilt it myself. After my engine ran away and I took it apart, the cam plate, which was his also, had some damage, though I can't say how it was before the engine ran away, I imagine it was from the excessive rpm's. The head itself seemed fine however. There have been a few complaints about the complete pumps on the list from what I remember, but who knows how many list members have bought them.