269 Motorsports LS header stud kit — 12 M8 polished 304 stainless studs & locking flange nuts for LS1-LS7

269 Motorsports LS header stud kit is a polished 304 stainless steel M8 stud-and-nut set engineered to secure aftermarket headers or exhaust manifolds to Gen III/IV Chevrolet LS family cylinder heads.

If you're installing performance headers or replacing a corroded factory fastener set on LSx V8 engines—covering LS1, LS2, LS3, LS6, LS7 and 4.8/5.3/6.0/6.2L Vortec truck engines—this kit supplies the matching studs and locking flange nuts designed for a durable, leak-resistant connection. The package contains twelve polished M8 studs and twelve M8 hex locking flange nuts made from hardened 304 stainless steel, and the studs accept a #4 Allen key for installation. These components resist corrosion better than plated steel bolts and simplify alignment and reassembly during header work.

What exactly comes in the kit and what are the specs?

The kit includes everything needed to attach one header or exhaust manifold to a single cylinder head flange on LS Gen III/IV engines. All parts are made of hardened 304 stainless steel for strength and corrosion resistance.

• 12 × polished M8 header studs compatible with LS flange holes
• 12 × M8 hex locking flange nuts for secure fastening
• Studs accept a #4 Allen key/socket for straightforward installation
• Material: hardened 304 stainless steel for long-term durability

How does this kit make header installation easier?

Using studs rather than bolts helps align the header to the head flange before tightening, reducing gasket movement and simplifying one-person installs. The Allen drive on the stud ends allows you to thread studs into tight engine bays without a long external wrench.

• Studs hold the header in place while you position gaskets and nuts
• Polished studs resist galling and ease repeated disassembly
• Flange nuts provide wide contact area to prevent flange distortion
• #4 Allen fit lets you install studs from the accessible side in cramped spaces

Will these studs fit my LS engine and headers?

The geometry and thread size are matched to standard Gen III/IV LS header flange locations and M8 threaded holes found on LSx cylinder heads. They are suitable for most aftermarket and OEM-style headers designed for Chevy LS series engines.

• Compatible with LS1, LS2, LS3, LS6, LS7 and LSX family heads
• Fits 4.8, 5.3, 6.0 and 6.2L Vortec truck engines using LS-style flanges
• Designed to replace factory bolts or studs with a stainless upgrade
• Confirm thread pitch and length with your specific headers before installation

Who is this for? This 269 Motorsports stainless steel LS header stud kit is aimed at DIY mechanics, professional installers, and performance builders who want a corrosion-resistant, robust fastener solution when fitting or servicing headers on Gen III/IV Chevy V8 engines. It’s ideal for vehicles exposed to road salt or high temperatures where plated fasteners corrode, and for anyone wanting easier alignment and repeatable torqueing during header installation and maintenance.