This gasket has larger port opening and can be cut to fit your head if necessary. The material is composed of something similar to asbestos, which causes cancer in Ca. I think it is made of old camel manure [they do not smell bad] or something very exotic. The bottom line is they do work and have been for many years. Will fit all "A" series heads.

Manifold IN/EX Gasket

SKU: WCM-104