Doug's Full Length Headers - 1.75 in Primary - 3 in Collector - Ceramic - GM LS-Series - GM A-Body 1964-72 - Pair 9211CPL Two 6 AN Female Ports

Two 6 AN Female Ports

Holley Round Head Type Jets

Sounds like dirt may have gotten in the relief valve

Easily mounts with two 1/4" bolts or tie wraps

Doug's Full Length Headers - 1.75 in Primary - 3 in Collector - Ceramic - GM LS-Series - GM A-Body 1964-72 - Pair 9211CPL Two 6 AN Female PortsProduct Description: Headers Full Length 1. 75 in Primary 3 in Collector Steel Ceramic GM LS Series GM A Body 1964 72 Pair Dougs Headers, the most respected name in the header industry since the 60s, began in 1958 as a small muffler shop in East Los Angeles, California. Every Dougs header comes with all the necessary mounting hardware, collector reducers or connector pipes, premium gaskets and detailed installation instruction sheets. Our extra thick