Doug's Full Length Headers - 1.75 in Primary - 3 in Collector - Ceramic - GM LS-Series - GM A-Body 1964-72 - Pair 9211CPL Connector Kit

Connector Kit

Sounds like dirt may have gotten in the relief valve

2-1/4 Male Probe

83 in Rectangular Port

Form-A-Barrier solves the problem of needing a light weight

Doug's Full Length Headers - 1.75 in Primary - 3 in Collector - Ceramic - GM LS-Series - GM A-Body 1964-72 - Pair 9211CPL Connector KitProduct 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