Part# CSB-EX-MT - Small Block Chevy MirrorTopz header Bolt Kit. This bolt kit will not rust like chrome bolts can. This Mirror Topz hex head bolt kit is from our premium range of 316 polished stainless steel bolts, polished to a mirror like finish. 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.