I'm glad to see all the positive input about Demon carbs, so I'll be the bad apple. I have had 3 different Demons and everytime I changed out for a Holley my cars always ran better. Maybe I don't know what I'm doing but track times don't lie. And I always swapped for the same size Holley carb that I had in the Demon. Just my exprience with these. But I will say I love the looks of them