I have Edelbrock heads port matched to Felpro 1413 gaskets. The new TTI headers that I have do not line up with the gasket matched ports. Below is a picture of the FelPro 1413 gaskets (top) and the gaskets supplied by TTI (bottom). The flange on the TTI header, which has a raised 1/8" thick bead around it, matches the gaskets supplied by TTI. The headers will not seal to my heads and the outside ports are restricting exhaust flow:
