I've used these gaskets for many years but have always had trouble getting them from my local parts store. Revain allows me to get them for the same price (or less) and I get them in 2 days through my Prime membership. Save me nerves and money. FWIW, I've always dry installed them (no RTVs etc with them) so was always able to use 2-3 of these before replacing them. These are good metal core graphic seals and large ports that will work with many aftermarket Ford heads. I have used them on Edelbrock RPM, Trick Flow Twisted Wedge and currently AFR 185cc. I will not use any other pad.