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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies
I have Evacuation running from my valve covers to my collectors. Uses a 3/4 inch pipethread bung welded into the collector. But I have been reading up and they say that if you run mufflers its virtually impossible to create vacuum there. so I dont really know if its doing a whole lot