Chevy Big Block 1964-1977 (Chevelle/Malibu/El Camino) HeadersARH Big Block A Body headers are here and ready to unleash the beast within. For models from 64 77, our headers can handle over 700hp easily. Fits standard deck blocks and heads with stock or mildly raised ports. Note: These headers have been prototyped with a Power Master 9540 Starter. Product features on this system includes: 100% Made in the USA Never Outsourced Made entirely of 304 stainless steel 3 8" thick laser cut flanges for a warp free seal