GM-Big Block Chevy- AJPE 5.0" Bore Space Pro Stock Stainless Header Flange- 2 1/2" Port

Precision laser cut from 3/8" thick 304 Stainless Steel, our header flanges are manufactured in the U.S. and are machine surfaced. These header flanges are compatible with the specialty AJPE 5.0" Bore Space STG I &III 'Big Bore' Pro Stock Heads. They have a 5" bore spacing and a 3.53" diagonal bolt space

Port Size: 2.50" Round Port

Welded primary stubs are 2" long and are 2 1/2" OD.

We carry over 450 different header flange designs, so if you don't see the flange you're looking for, talk with one our tech reps about custom header flange cutting.

Flanges sold separately.