Stainless Steel Exhaust Manifold Header for Chevy Small Block 283/302/305/307/327/350/400 V8 Engine

100% brand new, Never been tried or installed Outlet Size: 2.5" Primary Tube Size: 1 5/8" Number of O2 Sensor Locations: 0 Head Flange Thickness: 7/16" Outlet Flange Thickness: 3/8" Designed to fit the Chevrolet Small Block 262, 265, 267, 283, 302, 305, 307, 327, 350 & 400 V8 Engine. Hugs the block for a closer fit and extra clearance Headers features 8-2 light weight design. Designed to fit many vehicles and not specific to the ones below. CNC machine flanges with TIG and MIG welded construction. Product does not come with installation instructions, please refer to a shop/factory manual for installation. No instructions included, Professional installation is highly recommended