This precision laser cut Small Block Chevy header flange is cut from 3/8" thick 1018 cold rolled steel, our header flanges are manufactured in the U.S. These header flanges were fabricated specifically for the Sonny's BBC 5.3 GM style head. Configured with a 2 1/2" round port for easy header fabrication.
Port Size: 2.500"
We carry over 250 different header flange designs, so if you don't see the flange your looking for, talk with one of our tech reps about custom header flange cutting.
Flanges Sold Separately
