You want header bolts that won’t seize, rust, or fail under high heat, and clear choices by thread, material, and coating make selection simple.
This guide covers top kits for SBC, LS, and modern engines and explains why stainless, Grade 10.9, chromoly, and Dacromet or zinc‑nickel finishes matter.
Thread pitches and head styles are called out so bolts fit, clamp correctly, and survive repeated heat cycles.
Start with these best options to match your build and avoid stuck or broken fasteners during service.
| SBF/BBF Stainless Steel Exhaust Header Bolt Kit |
| Aerospace Quality | Quantity: Kit (number not explicitly stated; includes bolts & washers for SBF/BBF applications) | Thread Size / Type: 3/8-16 (UNC) bolts | Material / Grade: 18-8 stainless steel | VIEW LATEST PRICE | Read Our Analysis |
| Exhaust Manifold Bolts for GM LS Engines (12 PCS) |
| OEM Replacement | Quantity: 12 pieces | Thread Size / Type: M8 x 1.25 | Material / Grade: Grade 10.9 (alloy/galvanized with black coating) | VIEW LATEST PRICE | Read Our Analysis |
| Stud Hardware Chrome Moly Header Bolts (16 Pieces) |
| High-Strength | Quantity: 16 pieces | Thread Size / Type: (metric/imperial not specified; designed to OEM specs — typical header bolt size) | Material / Grade: Chrome moly steel | VIEW LATEST PRICE | Read Our Analysis |
| Dorman Exhaust Manifold Hardware Kit (M8 Stainless) |
| Heat-Resistant | Quantity: 12 bolts | Thread Size / Type: M8-1.25 x 30 mm | Material / Grade: 100% stainless steel | VIEW LATEST PRICE | Read Our Analysis |
| SBC Stainless Steel Exhaust Header Bolt Kit |
| SBC Fitment | Quantity: Kit (number not explicitly stated; bolts + washers for SBC) | Thread Size / Type: 3/8-16 | Material / Grade: 18-8 stainless steel | VIEW LATEST PRICE | Read Our Analysis |
| Exhaust Manifold Header Bolt Kit for LS Engines |
| Wide Compatibility | Quantity: 12 pieces | Thread Size / Type: M8 x 1.25 x 30 mm | Material / Grade: Stainless steel, manufacturer grade 10.9 | VIEW LATEST PRICE | Read Our Analysis |
| M8x1.25 Exhaust Manifold Bolts (12PCS) |
| LS Specialist | Quantity: 12 pieces | Thread Size / Type: M8 x 1.25 | Material / Grade: Grade 10.9 carbon steel | VIEW LATEST PRICE | Read Our Analysis |
| LS Series Exhaust Manifold Header Bolt Kit (12PCS) |
| Corrosion-Proof | Quantity: 12 pieces | Thread Size / Type: M8 x 1.25 | Material / Grade: Heavy-duty alloy steel, Grade 10.9 | VIEW LATEST PRICE | Read Our Analysis |
| Dorman 03413B Exhaust Manifold Hardware Kit Compatible with Select Models |
| Factory Match | Quantity: Kit (contents match OE; exact count not specified) | Thread Size / Type: (OEM equivalent; specific thread not listed — matches original exhaust manifold hardware) | Material / Grade: Quality components (material not explicitly stated; described as durable) | VIEW LATEST PRICE | Read Our Analysis |
| Car Exhaust Manifold Bolts Kit M10x1.5 (2PCS) |
| Spring-Loaded | Quantity: 2 pieces (stud kit: 2 studs, 2 nuts, 2 washers, 2 springs) | Thread Size / Type: M10 x 1.5 (stud diameter/thread pitch listed as 1.5 mm) | Material / Grade: Manganese steel / 45-gauge steel (studs & hardware) | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
SBF/BBF Stainless Steel Exhaust Header Bolt Kit
In case you want a bolt kit that feels as tough and reliable as the rest of your build, the SBF BBF Stainless-Steel Exhaust Header Bolt Kit is the one to reach for. You’ll get 3/8-16 x 1 inch bolts and washers that fit Small and Big Block Ford V8s, including 260 through 460 and FE families, and headers with up to 1/2 inch flange. The hardware uses a 5/16 inch Allen wrench. Made from 18-8 stainless steel, these bolts won’t rust like chrome or plain steel. They meet ASME ANSI specs and come from an aerospace certified maker, so you can trust their consistency.
- Quantity:Kit (number not explicitly stated; includes bolts & washers for SBF/BBF applications)
- Thread Size / Type:3/8-16 (UNC) bolts
- Material / Grade:18-8 stainless steel
- Corrosion Resistance / Finish:Stainless (will not rust/corrode like chrome or plain steel)
- Application / Fitment:Ford Small & Big-Block V8s (SBF/BBF engines listed)
- Head / Drive Style:Allen (5/16″ Allen drive required)
- Additional Feature:Aerospace-grade manufacturing
- Additional Feature:Fits up to 1/2″ flanges
- Additional Feature:Used on Ford FE engines
Exhaust Manifold Bolts for GM LS Engines (12 PCS)
Whenever restoring or upgrading a GM LS or LT engine and want bolts that won’t let you down, these 12 M8 exhaust manifold bolts are a smart choice because they combine Grade 10.9 strength with a corrosion-resistant black galvanized finish that helps prevent thread seizure and makes installation easier. You’ll get 12 M8 x 1.25 x 25 mm hex bolts that fit LS1 LS2 LS3 LSX and LT engines from 1997 up. They feel solid in your hand, resist rust, and match the GM 12617944 gasket profile. You can request replacements and use the 30 day return should needed.
- Quantity:12 pieces
- Thread Size / Type:M8 x 1.25
- Material / Grade:Grade 10.9 (alloy/galvanized with black coating)
- Corrosion Resistance / Finish:Galvanized with special black coating / black oxide finish
- Application / Fitment:GM LS & LT series engines (LS1/LS3/LS2/LSX/LT series)
- Head / Drive Style:Hex head (flat head / hexagon)
- Additional Feature:Replace OEM 551696
- Additional Feature:Black protective coating
- Additional Feature:12-piece OEM-style pack
Stud Hardware Chrome Moly Header Bolts (16 Pieces)
You’ll appreciate these Stud Hardware chrome moly header bolts whenever you need reliable strength and a precise fit for high-heat exhaust work, because they’re built from chrome moly steel with a black oxide finish that resists corrosion and keeps parts tight under stress. You get 16 pieces that meet OEM specs so installation feels confident and stays secure. The hex heads work with standard wrenches and sockets, so you won’t need special tools. They suit cars, bikes, and light industrial gear, and they handle heat and vibration well. You’ll feel reassured choosing durable, precise fasteners for long service life.
- Quantity:16 pieces
- Thread Size / Type:(metric/imperial not specified; designed to OEM specs — typical header bolt size)
- Material / Grade:Chrome moly steel
- Corrosion Resistance / Finish:Black oxide finish (chrome moly)
- Application / Fitment:General automotive/motorcycle/industrial header applications (OEM-spec fit)
- Head / Drive Style:Hex-style head (compatible with standard wrenches/sockets)
- Additional Feature:Chrome‑moly construction
- Additional Feature:OEM-spec fitment
- Additional Feature:16-piece set
Dorman Exhaust Manifold Hardware Kit (M8 Stainless)
Provided you want bolts that stay strong under extreme heat and won’t rust out after a season, the Dorman Exhaust Manifold Hardware Kit with M8 stainless bolts is a smart choice for mechanics and DIYers who value lasting reliability. You get twelve M8-1.25 x 30mm bolts made from 100% stainless steel so corrosion and heat won’t ruin them. The kit contains all hardware needed to install one exhaust manifold, and matches the fit and function of factory fasteners for select models. You can check fit entering your vehicle details into Dorman’s garage tool. Backed by U.S. experts, it feels dependable.
- Quantity:12 bolts
- Thread Size / Type:M8-1.25 x 30 mm
- Material / Grade:100% stainless steel
- Corrosion Resistance / Finish:Stainless (superior corrosion resistance)
- Application / Fitment:Select OE-fit exhaust manifold applications (use garage tool to confirm)
- Head / Drive Style:Hex head (M8 hex bolts)
- Additional Feature:Complete application kit
- Additional Feature:OE FIX compatibility
- Additional Feature:U.S.-based support
SBC Stainless Steel Exhaust Header Bolt Kit
In case you want a reliable, rust-resistant bolt kit for your small block Chevy headers, the SBC Stainless Steel Exhaust Header Bolt Kit is a strong choice because it’s made from high-grade 18-8 stainless and fits common SBC and similar V8 engines. You’ll get 3/8-16 x 1 inch bolts with matching washers that handle header flanges up to 1/2 inch thick. They need a 5/16 inch Allen wrench or socket, so grab that tool before you start. They resist corrosion better than plated bolts, and they suit many Chevy, Pontiac, Buick, and Oldsmobile V8s, though not OEM manifolds.
- Quantity:Kit (number not explicitly stated; bolts + washers for SBC)
- Thread Size / Type:3/8-16
- Material / Grade:18-8 stainless steel
- Corrosion Resistance / Finish:Stainless (resists rust/corrosion)
- Application / Fitment:Chevrolet small-block & related V8s (SBC, Pontiac/Buick/Olds V8s listed)
- Head / Drive Style:Allen drive (5/16″ Allen required)
- Additional Feature:Fits up to 1/2″ flanges
- Additional Feature:Chevy small‑block specific
- Additional Feature:5/16″ Allen drive
Exhaust Manifold Header Bolt Kit for LS Engines
In case you drive or work on LS-series engines and want bolts that won’t fail under heat and vibration, these M8 x 1.25 x 30 mm stainless steel header bolts are a smart choice because they combine Grade 10.9 strength with corrosion resistance for long-lasting fitment. You’ll get 12 pieces sized for LSX, LS2, LS3, LS6, LS7 engines and many Chevrolet, GMC, Buick, Cadillac, Hummer, Isuzu, Oldsmobile, Saab, Volkswagen, Chrysler and Dodge models. They use M8-1.25 metric threads, 2A class, hex heads and a waterproof rustproof finish. Trust them for high strength, resistance to deformation and reliable reuse whenever you need durable replacement bolts.
- Quantity:12 pieces
- Thread Size / Type:M8 x 1.25 x 30 mm
- Material / Grade:Stainless steel, manufacturer grade 10.9
- Corrosion Resistance / Finish:Stainless, corrosion-resistant / waterproof, rustproof
- Application / Fitment:LS-series engines (wide GM compatibility list)
- Head / Drive Style:Hex head
- Additional Feature:Broad vehicle compatibility
- Additional Feature:M8 x 30mm length
- Additional Feature:Brand: SWQS (ES75120)
M8x1.25 Exhaust Manifold Bolts (12PCS)
In case you want bolts that’ll hold your LS or LT engine header tight through heat and vibration, this 12PCS M8x1.25 set is built for the job. You’ll get twelve Grade 10.9 carbon steel hex bolts sized M8 x 1.25 with a 0.98 inch threaded length. They match many GM LS and LT engines from 1997 to 2024, including Tahoe and Suburban models, but check OEM fitment initially. They resist deformation and loosening under vibration, so you can trust the seal. The bolts weigh three ounces, have a 0.39 inch hex head, and come from Salior with typical retailer warranty options.
- Quantity:12 pieces
- Thread Size / Type:M8 x 1.25
- Material / Grade:Grade 10.9 carbon steel
- Corrosion Resistance / Finish:(coated/treated for durability; specific coating not stated)
- Application / Fitment:GM LS/LT series engines (1997–2024; OEM# 551696)
- Head / Drive Style:Hexagon bolt (hex head)
- Additional Feature:Manufacturer: Salior
- Additional Feature:Thread class 1A
- Additional Feature:12-bolt replacement set
LS Series Exhaust Manifold Header Bolt Kit (12PCS)
You’ll appreciate how this 12-piece LS Series exhaust manifold header bolt kit delivers reliable, professional-grade fastening while you’re working on an LS swap or rebuild. You get twelve flanged head bolts that replace OEM 551696 and fit many LS engines like LS1 LS2 LS3 LS6 LSX and more. They’re made from heavy-duty alloy steel with a Grade 10.9 rating so they hold up under high torque vibration and heat. The Dacromet coating prevents rust in salty or wet conditions without causing hydrogen embrittlement. Mechanics and DIYers trust this JIS-spec kit for precise fit and long-term exhaust manifold security.
- Quantity:12 pieces
- Thread Size / Type:M8 x 1.25
- Material / Grade:Heavy-duty alloy steel, Grade 10.9
- Corrosion Resistance / Finish:Dacromet coating for superior corrosion resistance
- Application / Fitment:LS-series engines (direct replacement for OEM 551696)
- Head / Drive Style:Integrated flanged head (no washers required; hex-style/hex head replacement)
- Additional Feature:Integrated flanged heads
- Additional Feature:Dacromet corrosion coating
- Additional Feature:Direct OEM 551696 replacement
Dorman 03413B Exhaust Manifold Hardware Kit Compatible with Select Models
In case you need a dependable fix for a noisy or loose exhaust manifold, the Dorman 03413B Exhaust Manifold Hardware Kit is a smart choice because it matches the original fasteners engineers used and gives you the parts to secure the manifold the right way. You’ll get quality components that replace missing or damaged bolts and studs so your manifold sits tight and works properly. Check fit via entering your make, model, and trim into Dorman’s garage tool before ordering. Dorman backs the kit with U.S. product experts and long automotive experience, so you can feel confident installing and driving.
- Quantity:Kit (contents match OE; exact count not specified)
- Thread Size / Type:(OEM equivalent; specific thread not listed — matches original exhaust manifold hardware)
- Material / Grade:Quality components (material not explicitly stated; described as durable)
- Corrosion Resistance / Finish:Described as quality/durable components (corrosion-resistant implied)
- Application / Fitment:Select vehicle models (matches original manifold hardware; confirm fit)
- Head / Drive Style:Matches original hardware (head style per OE; typically hex/bolt heads)
- Additional Feature:Matches original hardware
- Additional Feature:Vehicle-specific fit check
- Additional Feature:Backed by Dorman expertise
Car Exhaust Manifold Bolts Kit M10x1.5 (2PCS)
Assuming you’re swapping a worn exhaust manifold or upgrading headers, pick these M10x1.5 bolts whenever you fancy a durable, vibration-resistant fastener that keeps the gasket sealed under heat. You’ll get a two piece kit with studs, nuts, washers, and springs that work together to hold parts tight. The springs absorb shock and shift with temperature so the seal stays steady. Made from manganese and 45 gauge steel, these fasteners resist high heat and keep performing under vibration. Check the 2.9 inch length, 9.7 mm diameter, and 1.5 mm pitch against your vehicle before you buy.
- Quantity:2 pieces (stud kit: 2 studs, 2 nuts, 2 washers, 2 springs)
- Thread Size / Type:M10 x 1.5 (stud diameter/thread pitch listed as 1.5 mm)
- Material / Grade:Manganese steel / 45-gauge steel (studs & hardware)
- Corrosion Resistance / Finish:High-temp manganese/45-steel (heat resistant; corrosion resistance not emphasized)
- Application / Fitment:Most cars (general exhaust manifold stud kit; check dimensions)
- Head / Drive Style:Stud with nut (stud/nut/washers/springs; nuts use standard wrench/socket)
- Additional Feature:Includes springs and washers
- Additional Feature:Shock-absorbing spring design
- Additional Feature:Stud-and-nut style set
Factors to Consider When Choosing Exhaust Header Bolts
As you’re choosing exhaust header bolts, focus initially on the material and thread size so the bolts fit and handle the engine’s heat. Also consider about corrosion resistance and the bolt’s temperature rating, since stainless or coated bolts can last much longer under high heat. Finally, pick a head style and drive that match your tools and access, because the right fit makes installation easier and safer.
Bolt Material Choice
Because your exhaust bolts face heat, vibration, and salty road spray, choosing the right material matters more than you might believe. You want bolts that resist rust and keep strength at high temperature. Stainless steels like 18-8 or 304 give long life and a clean look. High strength alloy steels such as chrome moly or Grade 10.9 give higher tensile and shear resistance whenever clamping loads are heavy. Carbon steel fasteners with coatings can protect initially, but coatings can deteriorate under exhaust heat and lead to faster corrosion. Temperature capability matters since some plated steels can lose protection or suffer damage whenever hot. Match material to your engine environment and flange thickness so bolts won’t stretch or seize over time.
Thread Size Fitment
In case you want your headers to seal and last, matching thread size and fit is the initial step you’ll take. You should match thread size and pitch to the head or flange, like 3/8-16 for many American small blocks or M8×1.25 for many metric engines. Also check coarse versus fine thread class, since fine threads give better clamping precision and resist vibration while coarse threads stay stronger in softer materials. Next confirm bolt length and make certain at least 1.5 times the bolt diameter of full engagement so bolts don’t bottom out or leave too few threads. Decide whether studs, flat bolts, or flange-head bolts are needed and whether washers or captive nuts fit. In case threads look damaged re-tap or fit a thread insert before installing new bolts.
Corrosion Resistance Needs
Provided you want your header bolts to last and be removable without drama, pick materials and finishes that match the heat and environment they’ll face. You’ll do best with stainless alloys like 18-8 or 304 for routine exhaust heat and moisture. For harsher or coastal conditions, lean toward high grade coated steels or zinc nickel finishes that resist salt and humidity. Also consider fastener strength; a high strength grade with proper corrosion protection gives you durability and less risk of galvanic failure. Seek finishes that stop thread seizure and avoid hydrogen embrittlement, such as Dacromet or well applied coatings with lubricants. Match dissimilar metals thoughtfully and use anti seize where recommended to ease future removal and protect coatings.
Heat And Temperature Rating
At that moment you’re choosing header bolts, consider about the heat they’ll face and how that heat will alter the bolts over time. You want fasteners made from materials that keep strength when hot, like stainless steel or chrome-moly, because exhaust temps often hit 400 to 1000°F. Check the bolt’s temperature rating so it can handle continuous exposure to at least 600°F and short spikes above 1000°F. Also regard loss of preload and creep resistance, and pick alloys with low creep under thermal cycling so clamps stay tight. Watch coatings too, since some finishes can deteriorate, seize, or cause embrittlement at high heat. For turbo or high-performance engines, prioritize high temperature ratings and higher strength classes.
Head Style And Drive
Whenever you’ve got tight spaces and hot metal, the head style and drive of your header bolts can make the job much easier or turn it into a frustrating afternoon. You’ll pick hex, Allen, or flanged heads based on clearance and tool access. Hex heads stick out more but give strong socket engagement and handle higher torque. Allen heads sit low and clear tight spots but can round out should you over-torque them. Flanged or washer-style heads spread the clamp load, protecting thin flanges and preventing pull-through. Consider head height and width next. Low-profile heads fit where space is tight, while taller heads let sockets bite better and resist rounding. For repeat service choose drives that match impact or torque tools and finishes that resist galling and corrosion.
Torque And Strength Specs
You picked the right head style and drive for tight clearances, but now you need to make sure those bolts will actually hold under heat and vibration, so let’s talk torque and strength specs. Use bolts with specified tensile strength like grade 8 or 10.9 so they resist stretching in hot cycles. Torque to the maker’s value, often 20 to 40 ft-lb for 3/8 or M8, but confirm your engine spec. Use a calibrated torque wrench and tighten progressively in a crisscross pattern to get even flange contact and correct preload. In the event you reuse studs or bolts, check for elongation or thread damage because worn fasteners won’t hold clamp load. Consider proper hardness and coatings, and treat torque-to-yield fasteners as single use only.
Flange Thickness Compatibility
Because flange thickness directly affects how a bolt engages the threads, you’ll want to measure the combined height of the head flange, gasket, and washer before you pick a fastener. Take that measurement and compare it to the bolt length so you get at least the recommended thread engagement, usually one to one and a half times the bolt diameter. Check your header flange tolerance next since aftermarket flanges can be up to 1/2 inch thick, and make sure bolts clamp without bottoming out. For very thick flanges or multi piece systems choose longer studs or bolts to reach full thread bite. Whenever working with blind holes always factor in hole depth so you avoid stripped threads or bolts that prevent clamp load.
Coatings And Finishes
After you’ve checked flange thickness and bolt reach, the next thing to contemplate is what finish or coating will keep those bolts working and looking good over time. You want protection that matches your driving and climate. Black oxide looks sleek but gives minimal rust resistance and can wear off under heat or abrasion. Galvanized or zinc helps through sacrificing itself to stop corrosion, yet it loses effectiveness above about 350 to 400°F. Dacromet and similar inorganic coatings hold up in salty or humid places and avoid hydrogen embrittlement because they are not electroplated. Should you run high exhaust temperatures, choose native 304 stainless or passivated stainless so the alloy itself protects the bolt. Ceramic or heat resistant paints can cut radiant heat and look nice, but only when rated for continuous high temperatures.
