New for the DIY guys, grab the DXF and have your parts cut locally. No waiting, no shipping, no markup. This file is designed for Chevy Big Block (BBC) 396–502 header flange. We recommend running 3/8″ to 1/2″ material, so you’ve got enough thickness left after welding and final surfacing. Once purchased, you’ll get an instant download link to the DXF file. Please note: Compatible with most factory and aftermarket cylinder heads. Buyer is responsible for verifying port shape and dimensions for their specific application before cutting.
