【Compatible with 】--All 1955-1998/99 Chevy Small Block Exhaust Headers with aftermarket header flanges up to ½″ thick Flanges 265 283 305 307 327 350 383 400 (These do not fit oem manifolds)
【Compatible with 】--Pontiac Buick Oldsmobile 326 350 389 400 421 455 V8 Engines Using Exhaust Headers with aftermarket header flanges up to ½” Thick Flanges (These do not fit oem manifolds)
【Material】--Stainless-Steel Steel 3/8-16x1” Bolts and Washers That will NOT rust or Corrode like the chrome or steel ones sold. These Use a 5/16” Allen Wrench/Socket