These headers when installing a GM V-8. Fits all SBC 265-400. It helps with room under the hood and looks so much better than the normal over the fenderwell header. Features a Great for Tight Fit applications, Ports are Precisely Finished and Fit with a Sturdy Welded Leak Proof O-Ring Port Seal, Flash Controlled Mandrel-Bent Tubing, Complete with All Mounting Hardware and Premium Quality Gaskets, Made in the U.S.A.!