Best Bolts For Exhaust Manifold: Compare Fit and Hardware

#1 · Best Overall

1. Dorman 03413HP

• Weight: 7.4 oz

Best for: Stainless OE-Style Replacement.

Why it ranks #1: Twelve stainless-steel M8-1.25 x 30mm bolts provide a defined set for one manifold, and the product describes an application-specific, factory-style fit.

Dorman’s OE FIX set uses twelve 100 percent stainless-steel M8-1.25 x 30 mm bolts, bringing a specified material and quantity to manifold replacement. Dorman identifies thermal cycling and corrosion as causes of factory-style bolt failure, positioning this set as an upgraded hardware option for select models.

The twelve-bolt quantity is described as all application-specific hardware necessary to install one exhaust manifold, helping define the scope of the repair. Stainless-steel construction is specified for heat and corrosion resistance, while the bolts are said to match factory fastener fit and function. Their M8-1.25 x 30 mm dimensions are useful for checking the application. Compatibility remains limited to select models, so use the vehicle-specific listing rather than assuming broad coverage.

Skip it if you need universal vehicle coverage; ARP 134-1202 is listed for Chevrolet Gen III/LS headers instead.

This Dorman OE FIX set suits a buyer replacing manifold hardware on a select compatible model, especially where stainless-steel construction is a priority. Check the vehicle application before work; its stated fit is not universal.

Listed on Amazon as: Dorman 03413HP Exhaust Manifold Hardware Kit – M8-1.25 Stainless Steel Compatible with Select Models (OE FIX)

#2 · Best 30mm LS Kit

2. BEONEO ES75120

• Weight: 9.6 oz

Best for: Broad LS Vehicle Coverage.

Why it ranks #2: This ES75120 kit lists M8x1.25x30mm bolts and broad Chevrolet, GMC, and other vehicle applications, though buyers must verify exact fitment.

BEONEO lists a wide range of Chevrolet, GMC, Cadillac, and Buick applications, giving LS-family vehicle owners a broad starting point for finding replacement manifold bolts. The title specifies M8 x 1.25 x 30 mm stainless-steel hardware, making thread and length details central to the fit decision.

The stated M8 x 1.25 x 30 mm size gives buyers concrete thread and length information to compare with their repair needs, while the stainless-steel description identifies the supplied material. The compatibility list includes Silverado, Sierra, Tahoe, Yukon, Express, and other named vehicles and years, so it can support several repair contexts. That breadth does not make the bolts universal: BEONEO specifically advises checking year, make, and model before ordering.

Skip it if you need a short, narrowly specified application list; this kit covers many vehicle lines and years.

Consider this BEONEO set when its listed vehicle application and M8 x 1.25 x 30 mm size match your repair. Its broad compatibility list still calls for careful year, make, and model verification before installation.

Listed on Amazon as: ES75120 M8x1.25x30mm Chevy Silverado 5.3 Exhaust Manifold Bolts for LS< Exhaust Manifold Hardware Kit Stainless Steel Suburban Tahoe Express GMC Savana Sierra Yukon Envoy 4.8 6.0 6.2L 10.9 ES 75120

#3 · High-Strength Option

3. ARP 134-1202

• Weight: 9.6 oz
• Material: Alloy Steel
• Thread Size: 8 mm x 1.25

Best for: High-Strength LS Header Hardware.

Why it ranks #3: The Gen III and LS-series header kit is alloy steel, and its description gives a 170,000 psi rating for buyers seeking a performance-oriented fastener.

ARP rates this Chevrolet Gen III/LS header hardware at 170,000 psi, making strength the defining specification for buyers addressing demanding header conditions. The alloy-steel kit has a black-oxide finish, and ARP describes it as much stronger than stock for severe operating conditions.

The stated 170,000 psi rating connects the kit’s strength specification to its intended use under severe conditions. ARP says each kit includes the specific number of parts required for the desired application, which can simplify gathering hardware for header installation. Alloy steel and black oxide are listed, along with an 8 mm x 1.25 thread size. The title identifies Chevrolet Gen III/LS Series fitment, so use that application boundary when selecting it.

Skip it if you need the bolt quantity stated before purchase; this listing does not provide a count.

ARP’s kit is for buyers working on Chevrolet Gen III or LS headers who value the stated 170,000 psi rating. Confirm application and hardware quantity for the job, since the supplied details do not specify a count.

Listed on Amazon as: ARP 134-1202 Chromoly Header Bolt Kits, Chevrolet Gen III/LS Series, 3/8 ̋ wide

#4 · Best Grade 10.9 Set

4. Salior 551696

• Weight: 3 oz
• Material: Grade 10.9 Carbon Steel
• Thread Size: M8x1.25

Best for: Twelve-Bolt LS Replacement Set.

Why it ranks #4: Its twelve M8x1.25 bolts are specified as grade 10.9 carbon steel, with listed compatibility for GM LS and LT series engines.

Twelve M8 x 1.25 bolts are the central feature of Salior’s replacement set, giving buyers a defined quantity and thread size for a manifold repair. The listing identifies Grade 10.9 carbon steel and OEM number 551696, helping narrow the choice to compatible GM LS and LT applications.

The M8 x 1.25 thread specification and 12-piece quantity make it easier to compare the set with a repair’s stated hardware needs. Salior identifies Grade 10.9 carbon steel, with reinforced construction described as supporting strength and durability. Compatibility is listed for GM LS and LT engines and selected Chevrolet vehicles, while OEM number 551696 provides another reference point. Check those application details before ordering; the listing does not establish fit for every engine or vehicle.

Skip it if you need hardware for an application outside the listed GM LS/LT and Chevrolet coverage; this set is not universal.

This Salior set fits buyers seeking twelve M8 x 1.25 bolts for a listed GM LS or LT repair. Use the OEM number and vehicle details to check fit, since the stated compatibility does not cover every application.

Listed on Amazon as: 12PCS M8x1.25 Exhaust Manifold Bolts OEM#551696,Grade 10.9 LS Header Bolts Compatible with GM LS LT Series Pontiac Chevrolet,LS Exhaust Manifold Bolts Replacement Car Accessories

#5

5. BEONEO 551696

• Thread Size: 0.31 inch

Best for: Corrosion-Coated LS Fasteners.

Why it ranks #5: This twelve-bolt kit specifies M8-1.25 x 25mm fasteners and lists compatibility with GM LS and LT series engines.

BEONEO specifies a black coating intended to protect its 10.9-grade bolts against corrosion and thread seizure, a useful detail for exhaust hardware exposed to heat and service. The set contains twelve M8-1.25 x 25 mm bolts and is listed for GM LS and LT series engines.

The 12-piece count and M8-1.25 x 25 mm dimensions give buyers a clear basis for checking whether the set suits their manifold repair. BEONEO identifies heavy-duty 10.9 bolts and galvanizing with a special black coating, described as providing corrosion protection against thread seizure. The listing gives replacement number 551696 and GM LS/LT coverage from 1997 onward. Confirm the exact vehicle and year before ordering, as the listing advises application checks.

Skip it if you require 30 mm bolts; MOXRUQ’s M8 x 1.25 x 30 mm set matches that stated length instead.

This BEONEO kit suits GM LS or LT owners whose repair calls for twelve M8-1.25 x 25 mm bolts and the listed 551696 reference. Check dimensions and vehicle application carefully, especially if the repair requires a different bolt length.

Listed on Amazon as: 551696 Exhaust Manifold Bolts,Manifold Header Bolts for GM LS1 LS3 LS2 LSX LT Series Engines 12 PCS for GM 12617944 Exhaust Manifold Gasket

#6

6. Fel-Pro ES 75120

• Weight: 2.88 oz
• Material: Alloy Steel

Best for: Application-Specific Repair Kit.

Why it ranks #6: The application-specific alloy-steel hardware kit has a rust-inhibiting organic coating, but its listed fitment spans many vehicles and needs careful checking.

Fel-Pro’s repair-environment engineering is the defining feature here, supporting exhaust-manifold repairs where sealing surfaces may be imperfect. The kit includes an exhaust manifold bolt set, while the listing also describes application-specific gasket construction intended to resist blow-out from high-temperature exhaust gases during service.

The alloy-steel hardware and verified organic coating address two practical concerns during manifold repair: fastening and rust inhibition. Fel-Pro also specifies a tightly controlled coefficient of friction, a detail relevant to consistent fastener behavior during installation. Its listed vehicle applications span multiple makes and models, so the vehicle-specific catalog information matters before ordering. The product is a bolt set, not a claim that a gasket is included; the supplied sealing details describe Fel-Pro gasket engineering separately.

Skip it if you need a stated bolt count or dimensions before ordering; the supplied listing provides neither.

Choose this Fel-Pro kit when its listed application matches your vehicle and you want hardware associated with a repair-focused brand. Check the vehicle application carefully, and note that the listing does not state the bolt count or individual dimensions.

Listed on Amazon as: FEL-PRO ES 75120 Exhaust Manifold Hardware Kit for Chevrolet Silverado 1500

#7

7. Dorman 03309

• Weight: 6.7 oz

Best for: Original-Hardware Replacement.

Why it ranks #7: This direct-replacement exhaust manifold hardware kit suits specified vehicles and offers a purpose-built alternative when original hardware is missing or damaged.

Dorman’s direct-replacement approach is the key advantage: the kit matches original hardware required to secure the exhaust manifold on specified vehicles. That makes it a practical route when existing fasteners are missing, damaged, or failed, with the application-specific vehicle listing serving as the boundary for choosing it.

The kit is described as a reliable replacement for original hardware, connecting its direct-replacement specification to a familiar repair workflow. Dorman says its quality components support reliable performance and long service life, useful considerations when replacing failed manifold fasteners. Compatibility is limited to specified vehicles, and the supplied information does not give a bolt count or dimensions. Check the vehicle trim and application details before purchase rather than treating this as a universal hardware set.

Skip it if you need published bolt dimensions or material details; this listing does not provide them.

This Dorman kit suits owners repairing a specified vehicle with missing or failed original manifold hardware. Use the vehicle and trim application details to establish fit; the supplied listing does not provide dimensions, material, or the number of fasteners.

Listed on Amazon as: Dorman 03309 Exhaust Manifold Hardware Kit Compatible with Select Models

#8

8. YEHERIT 5.7 Kit

• Material: Stainless Steel
• Thread Size: M8

Best for: Dodge And Ram Hardware.

Why it ranks #8: The M8 stainless-steel bolts and nuts list fitment for selected Dodge, Ram, Chrysler, and Jeep applications; buyers should confirm the replacement number.

YEHERIT names a substantial Dodge, Ram, Chrysler, and Jeep application range for this 5.7 exhaust-manifold bolt-and-nut replacement set. Its M8 stainless-steel hardware and listed replacement numbers give owners two practical ways to check whether it matches the repair they are preparing.

The vehicle list covers specified Challenger, Charger, Durango, Ram, 300, and Grand Cherokee applications, making application matching the first step. YEHERIT also supplies several replacement numbers, including 03309, so owners can compare the existing part reference with the listing. Stainless steel and M8 sizing are specified, and the hex head is identified. The fitment range is not universal; verify the vehicle and replacement number before starting a manifold repair.

Skip it if you are repairing a vehicle outside the listed Dodge, Ram, Chrysler, or Jeep applications; this set is not universal.

Choose this YEHERIT set for a listed 5.7 application when its vehicle details and replacement number align with the repair. Its stated coverage is specific to named Dodge, Ram, Chrysler, and Jeep models, so confirm those references first.

Listed on Amazon as: 5.7 Exhaust Manifold Bolts & Nuts Replace# 03309

#9

9. MOXRUQ M8 Kit

• Weight: 8.1 oz

Best for: Flange Bolt And Nut Set.

Why it ranks #9: The ten-piece kit lists M8 x 1.25 x 30mm carbon-steel bolts and nuts, but its broad compatibility language does not establish a specific vehicle fit.

MOXRUQ pairs M8 x 1.25 x 30 mm carbon-steel bolts with nuts, providing a combined hardware set for exhaust-manifold fastening. Its stated precision threading is intended to minimize alignment issues during installation, while the six-sided outer shape is described as helping resist slipping when fastening.

The M8 diameter, 1.25 mm pitch, and 30 mm length give useful dimensions for checking a repair’s requirements before work begins. Carbon steel is specified for strength and heat resistance, addressing the high-temperature setting of exhaust hardware. The listing also describes a hexagonal anti-slip shape, which can aid tool engagement during installation. Compatibility is phrased broadly as fitting most exhaust pipes, so buyers should rely on the stated measurements rather than assume a specific vehicle fit.

Skip it if you need confirmed fitment for a particular vehicle; the listing provides no vehicle-specific application list.

MOXRUQ suits buyers whose repair calls for the stated M8 x 1.25 x 30 mm bolt-and-nut hardware. Check thread and length against the application, as the supplied details do not identify specific vehicle fitments.

Listed on Amazon as: 10 PCS Exhaust Manifold Bolts, M8 x 1.25 x 30mm High Strength Carbon Steel Flange Exhaust Bolts and Nuts, Exhaust Manifold Bolt Hardware Kit

#10

10. The Revenant M10 Bolts

• Weight: 5 oz
• Material: High Temperature Resistant Steel
• Thread Size: M10x1.5

Best for: M10 Stud-Style Bolt Pair.

Why it ranks #10: This pair uses M10x1.5 threads and high-temperature-resistant steel, but its two-piece count and general fit claim make it less suited to typical full-manifold replacement.

The Revenant supplies two M10 x 1.5 manifold bolts with a stated 2.9-inch overall length, making this pair distinct from shorter M8 multi-bolt sets. High-temperature-resistant steel is specified, and the listing also gives stud and thread measurements for checking the intended repair.

The listed 9.7 mm stud diameter, 1.5 mm thread pitch, and 1.35-inch thread length provide specific dimensions to compare with the hardware being replaced. High-temperature-resistant steel is described as suitable for harsh conditions, connecting the material choice to exhaust use. The package contains two bolts, so it serves a limited replacement need rather than a full manifold hardware set. Although the listing says most cars, check dimensions against the particular application.

Skip it if you need a complete multi-bolt manifold set; Dorman 03413HP includes twelve M8-1.25 x 30 mm bolts for one manifold.

The Revenant pair suits a repair requiring two M10 x 1.5 mm bolts of the stated length and stud dimensions. Match those measurements to the application; the two-piece quantity will not cover a complete manifold set.

Listed on Amazon as: 2PCS Car Exhaust Manifold Bolts (M10x1.5 mm)