I've heard nothing but good things about all his products. I've never ran a set of his heads, but wouldn't hesitate if I had them.
i have no experience with them. we camped next to him at the bend in the road at bonneville a couple years ago. the ardun overhead he made for a banger sure is nice.
I have a set of 24stud heads on my motor, although it hasn't fired yet. I have met Norm at Turlock a couple of years ago and he does some really nice work and have talked with him on the phone many times since then, really nice guy. I did talk with a guy in SoCal before I bought mine who had been running some 24stud for a couple of years with nothing but praise. I would not hesitate to buy another set even though my first set hasn't been run yet. IMHO