Part# CSB-EX-KBButn - Small Block Chevy header Bolt Kit. This bolt kit will not rust like chrome bolts can. This KustomBitz button head bolt kit is from our standard range of 304 polished stainless steel bolts, polished to our standard Kustom Bitz finish. These are the bolts that have the Allen Key hex type slot in a shallow dome, wide flange head that looks as neat as a button on a shirt. This custom exhaust header bolt kit will suit all small block Chev 307, 327, 350, 400 V8 engines. This bolt kit comes complete with 12 x bolts, washers and spring washers to enable you to bolt typical aftermarket headers [with a flat 3/8 thick flange] to a small block Chevrolet engine.This kit completes the look when you have your exhaust headers ceramic coated by companies like the Jet Hot or HPC brands.