Dorman 674-203 Exhaust Manifold - Left
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Dorman

Dorman 674-203 Exhaust Manifold - Left

Brand Dorman 674-203
Position Left
Color Natural
Gasket Or Seal Included Yes
Grade Type Regular
Heat Shield Included No
Material Cast Iron
Mounting Hardware Included Yes
Package Contents Exhaust Manifold; 1 Manifold Gasket; 3 Studs; 3 Nuts; 6 Washers
Port Shape Square
Fits Chevrolet and GMC · 53 vehicles

OE-style replacement. Precision-engineered to match original fit and function.

Cast iron construction. Durably manufactured for dependable exhaust performance.

Complete repair kit. Includes gaskets and downpipe hardware for installation.

Cross-references ATP 101083 and 336710 for the same application. See all 2.

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Exhaust Manifold for Chevrolet and GMC V8 Applications

This Dorman exhaust manifold is precision-engineered to match the fit and function of the original part on specified vehicles. Built from cast iron with a natural finish, it is made for left-side exhaust repairs on classic Chevrolet and GMC trucks, vans, and utility models.

Part number 674-203 includes the manifold gasket and downpipe hardware needed for a complete repair. It is a direct-fit exhaust manifold solution for 1973-1976 Chevrolet and GMC applications, including Chevrolet C10, K10, Blazer, and GMC Jimmy fitments.

Key Features

  • Cast iron construction for durable exhaust service
  • Natural finish with square port shape
  • Left-side exhaust manifold for specified Chevrolet and GMC vehicles
  • Includes gasket and mounting hardware for the repair
  • OE-style fit and function for direct replacement use
  • Dorman 674-203 for classic truck, van, and SUV exhaust repairs

Detailed Description

Dorman 674-203 is an exhaust manifold designed for specified 1973-1976 Chevrolet and GMC vehicles, including left-side applications on Chevrolet C10, C20, C30, K10, K20, G10, G20, G30, P10, P20, P30, Blazer, and GMC Jimmy models. It is also listed for several GMC van applications and select California-emissions and LPG configurations. The cast iron body is built to match the original manifold’s fit and function, helping restore proper exhaust routing on the driver-side or left-side bank where equipped.

This part cross-references ATP 101083 for the same application. If you are replacing a cracked or leaking exhaust manifold on a Chevrolet C10 Suburban, GMC Jimmy, or a 1975 Chevrolet K10, 674-203 provides a direct replacement path with the necessary gasket and downpipe hardware included in the package contents.

What It Helps Repair

  • Exhaust leaks at the manifold-to-cylinder-head sealing surface
  • Cracks or warping in the original cast manifold
  • Broken or corroded manifold mounting points
  • Noise from escaping exhaust gases on the left side
  • Fitment issues during restoration of original exhaust routing

Installation Notes and Tips

Verify engine and emissions configuration before ordering, since fitment varies by year, model, and notes such as California emissions, LPG, carburetor, and transmission setup. This manifold is for left-side installation only. Inspect the cylinder head surface, fasteners, and downpipe connection points before assembly to help ensure a proper seal.

For vehicles such as the Chevrolet Blazer, C10, and GMC Jimmy, confirm the original exhaust layout and port shape match the replacement part. Use new sealing surfaces and follow factory torque procedures during installation.

Quality Assurance

Dorman manufactures this manifold to match original fit and function on the listed vehicles. The cast iron construction and included sealing hardware support a complete exhaust repair on compatible Chevrolet and GMC applications.

This part fits 53 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelBody TypeTransmissionLitersCylindersFuel TypePositionNotes
1976ChevroletG30——6.6LV8—Leftwo/California Emissions
1975ChevroletC10——5.7LV8—Left—
1975ChevroletC10 Suburban——5.7LV8—Left—
1975ChevroletC20——5.7LV8—Left—
1975ChevroletC20 Suburban——5.7LV8—Left—
1975ChevroletC30——5.7LV8—Left—
1975ChevroletG10——5.7LV8—Left—
1975ChevroletG20——6.6LV8—Left—
1975ChevroletG20——5.7LV8—Left—
1975ChevroletG30——6.6LV8—Left—
1975ChevroletG30——5.7LV8—Left—
1975ChevroletK10——6.6LV8—Left—
1975ChevroletK10——5.7LV8—Left—
1975ChevroletK10 Suburban——6.6LV8—Left—
1975ChevroletK10 Suburban——5.7LV8—Left—
1975ChevroletK20——6.6LV8—Left—
1975ChevroletK20——5.7LV8—Left—
1975ChevroletK20 Suburban——6.6LV8—Left—
1975ChevroletK20 Suburban——5.7LV8—Left—
1975ChevroletK5 Blazer——6.6LV8—Left—
1975ChevroletK5 Blazer——5.7LV8—Left—
1975ChevroletP10——5.7LV8—Left—
1975ChevroletP20——5.7LV8—Left—
1975ChevroletP30Standard Cargo Van—5.7LV8—Left—
1975ChevroletP30Stripped Chassis—5.7LV8—LeftFits vehicles with California Emissions.
1975GMCG15——5.7LV8—Left—
1975GMCG25——6.6LV8—Left—
1975GMCG25——5.7LV8—Left—
1975GMCG35——6.6LV8—Left—
1975GMCG35——5.7LV8—Left—
1975GMCJimmy——6.6LV8—Left—
1975GMCJimmy——5.7LV8—Left—
1974ChevroletBlazer—Automatic5.7LV8—Leftwo/California Emissions
1974ChevroletC10 Suburban—Automatic5.7LV8—Leftwo/California Emissions
1974ChevroletC20 Suburban—Automatic5.7LV8—Leftwo/California Emissions
1974ChevroletK10 Suburban—Automatic5.7LV8—Leftwo/California Emissions
1974ChevroletK20 Suburban—Automatic5.7LV8—Leftwo/California Emissions
1974GMCG15/G1500 Van——5.7LV8—Left4 Barrel Carburetor; w/Automatic Transmission; wo/California Emissions
1974GMCG25/G2500 Van——5.7LV8—Left4 Barrel Carburetor; w/Automatic Transmission; wo/California Emissions
1974GMCG35/G3500 Van—Automatic5.7LV8—Left4 Barrel Carburetor; wo/California Emissions
1974GMCJimmy—Automatic5.7LV8—Leftwo/California Emissions
1973ChevroletBlazer——5.7LV8—Leftw/LPG
1973ChevroletC10 Suburban——5.0LV8—Leftwo/California Emissions
1973ChevroletC10 Suburban——5.7LV8LPGLeft—
1973ChevroletC20 Suburban——5.0LV8—Leftwo/California Emissions
1973ChevroletK10 Suburban——5.0LV8—Leftwo/California Emissions
1973ChevroletK10 Suburban——5.7LV8LPGLeft—
1973ChevroletK20 Suburban——5.0LV8—Leftwo/California Emissions
1973GMCG15/G1500 Van——5.0LV8—Leftwo/California Emissions
1973GMCG15/G1500 Van——5.7LV8—Left—
1973GMCG25/G2500 Van——5.0LV8—Leftwo/California Emissions
1973GMCG25/G2500 Van——5.7LV8—Left—
1973GMCJimmy——5.7LV8—Leftw/LPG
Directly replaces or cross-references 2 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ATP — 101083336710