But Midnight isn't finished – instead, she takes a step toward another shelf, lined with cylinder heads and valve train assemblies. "Heads seem to depend on the make. We don't sell much of Ford or Chevy heads unless it's a specific niche engine – which makes sense when you consider the aftermarket supply for them," she continues, rambling as if caught in her own little world now. "Lincoln, Cadillac, some Olds and Pontiac and oddball makes still sell pretty well, and anything 'factory stock' high performance like Chrysler 340 heads with their high flow design is worth keeping around."