Are you looking for a high quality and affordable set of 304 Stainless Steel Head Flanges for your LS? Look no further! Ace Race Parts' version of the GM LS1/LS2/LS3/LS6/LS9 compatible exhaust manifold head flanges are laser cut from 3/8" thick 304 Stainless Steel and have round ports that are optimized to be used with both standard tube size Mandrel Bends and pipe size Weld Els. Our LS Head Flanges are sold as a set of 2 flanges and feature a smooth, flat material finish on all sides.