Imo the your shops opinion is arrogant but mostly ignorant. The guy that hacked on mine with a rock has two national record holders and the div3 c/stk champ aaron allison and also does ALOT of work for Jeff taylor racing (Jeff who?) look it up. Please don't paint with such a wide brush pal.
They were joking when they said that. Radar (the shop owner) is a pioneer of the B1 head design and has done cylinder head work for people like John Force. They are just funny guys.