Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 1
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 2
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 3
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 4
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 5
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 6
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 7
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 1
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 2
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 3
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 4
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 5
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 6
Dorman 674-858 Exhaust Manifold 2003-2007 Chevrolet W3500 Tiltmaster - view 7
Dorman Products

Dorman 674-858 Right Exhaust Manifold 03-07 Isuzu NPR Chevy W4500 Tiltmaster

In stock
SKU: 591|674858
Confirm Fitment Before You Buy
Not sure it fits? Message Year/Make/Model/Engine (2WD/4WD if applicable) and we’ll help confirm compatibility.
Why buy from Koskowski Automotive?
• 50+ years (since 1972) • Dorman Authorized Seller • Fast shipping • Easy returns
$184.32
Select your vehicle at the top of the page to check fitment.
Vehicle Fitment: Use the table below to match your exact configuration. If you don’t see your exact setup, message us before ordering.

Product details

  • SKU 591|674858
  • Barcode 019495289197

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Description

This exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the original manifold on specified vehicles. It includes all necessary gaskets and downpipe hardware for a complete repair.

  • Ideal replacement - this exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the stock manifold on specified vehicles
  • Reliable construction - durable materials resist warping, cracking and leaking for long-lasting performance
  • Complete repair - includes all necessary gaskets and downpipe hardware
  • Trustworthy design - built by industry leader in aftermarket manifolds

Vehicle Fitment

Year Make Model Position Notes
2003-2007 Chevrolet W3500 Tiltmaster Right wo/Ceramic Coating; 6.0L V8
2003-2007 Chevrolet W4500 Tiltmaster Right wo/Ceramic Coating; 6.0L V8
2004-2007 GMC W3500 Forward Right wo/Ceramic Coating; 6.0L V8
2003-2007 GMC W4500 Forward Right wo/Ceramic Coating; 6.0L V8
2003-2007 Isuzu NPR Right wo/Ceramic Coating; 6.0L V8
2003-2007 Isuzu NPR-HD Right wo/Ceramic Coating; 6.0L V8
2004-2005 Workhorse FasTrack FT1461 Right wo/Ceramic Coating; 6.0L V8
2004-2005 Workhorse FasTrack FT1801 Right wo/Ceramic Coating; 6.0L V8
2007 Workhorse W18 Right wo/Ceramic Coating; 6.0L V8
2006-2007 Workhorse W42 Right wo/Ceramic Coating; 6.0L V8

Please confirm the part number and your vehicle's year, make, model and engine before ordering. Questions? Message us with your VIN and we'll check fitment for you.

Specifications

Brand Dorman
Part Number 674-858
UPC 019495289197
Placement Right
Material Cast Iron
Color Metallic Gray
Mounting Hardware Included Yes
Gasket Or Seal Included Yes
Port Shape Round
Grade Type Standard Replacement
Heat Shield Included Yes
Package Contents Exhaust Manifold; 1 Manifold Gasket; 3 Studs; 3 Nuts
Country of Origin China
Warranty Limited Lifetime

OE & Interchange Numbers

12603738 General Motors (OE)
8125706700 Isuzu (OE)
8126037390 Isuzu (OE)
12570670 General Motors (OE)
12603739 General Motors (OE)
101470 Interchange
663353 Interchange