Re: Got the Summit headers back from Ceramacoating !
I too am using the summit headers on my 1990 351 and absolutely love them. There was a very noticeable low torque improvement and its hard to say for sure but i think the mileage is a little better. It sounds a lot deeper too. I think they are one of the best upgrades for the money ive ever done. I also used a locking bolt kit from grade 8, also worth the money to not worry about the bolts coming loose.