How to replace the right exhaust manifold (4.8L, 5.3L, 6.0L) on 2003 Chevrolet Express 3500?

A replacement of the right Exhaust Manifold (4.8L, 5.3L, 6.0L) requires starting with a Catalytic Converter removal from the Exhaust Manifold then moving to engine cover and oil level indicator tube removal. Begin by uninstalling the Exhaust Manifold while removing its bolts before performing cleaning on all sealing connections. Installation starts with fitting the Exhaust Manifold before tightening each Exhaust Manifold bolt to 15 nm (11 ft-lbs in the first step followed by 25 Nm (18 ft-lbs in the second step). Secure the manifold by placing the oil level indicator tube in position before uniting the Catalytic Converter with the Exhaust Manifold followed by reinstallation of the engine cover.

OEM 2003 Chevrolet Express 3500 Exhaust Manifold

Engine Exhaust Manifold

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3 Exhaust Manifolds found

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2003 Chevrolet Express 3500 Exhaust Manifold, Driver Side
Part Number: 12616285
$117.36 MSRP: $171.88
You Save: $54.52 (32%)
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Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Driver Side
- Replaces: 12602037, 12562235, 12571678, 12564155
- Item Weight: 10.30 Pounds
- Item Dimensions: 9.7 x 8.2 x 24.7 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 12616285
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2003 Chevrolet Express 3500 Submodels:
- Base, LS, LT | 8 Cyl 4.8 L FLEX, 8 Cyl 4.8 L GAS, 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L FLEX, 8 Cyl 6.0 L GAS
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2003 Chevrolet Express 3500 Exhaust Manifold
Part Number: 12677665
$199.07 MSRP: $338.92
You Save: $139.85 (42%)
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Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Replaces: 12648339
- Item Weight: 14.40 Pounds
- Item Dimensions: 9.2 x 5.3 x 25.1 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 12677665
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2003 Chevrolet Express 3500 Submodels:
- Base, LS, LT | 8 Cyl 4.8 L FLEX, 8 Cyl 4.8 L GAS, 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L FLEX, 8 Cyl 6.0 L GAS
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2003 Chevrolet Express 3500 Exhaust Manifold, Passenger Side
Part Number: 12605246
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Passenger Side
- Replaces: 12562236, 12564157
- Item Weight: 13.90 Pounds
- Item Dimensions: 9.8 x 8.0 x 25.2 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 12605246
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2003 Chevrolet Express 3500 Submodels:
- Base, LS | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS

2003 Chevrolet Express 3500 Exhaust Manifold

With a comprehensive array of OEM 2003 Chevrolet Express 3500 Exhaust Manifold, from fuel pumps to door handles, our website is a one-stop-shop for your needs. All our genuine 2003 Chevrolet Express 3500 Exhaust Manifold are backed by the manufacturer's warranty and are offered at competitive prices in the market. Rest assured, you can shop with complete confidence.

2003 Chevrolet Express 3500 Parts Questions & Experts Answers

Q: How to replace the right exhaust manifold (4.8L, 5.3L, 6.0L) on 2003 Chevrolet Express 3500?
A: A replacement of the right Exhaust Manifold (4.8L, 5.3L, 6.0L) requires starting with a Catalytic Converter removal from the Exhaust Manifold then moving to engine cover and oil level indicator tube removal. Begin by uninstalling the Exhaust Manifold while removing its bolts before performing cleaning on all sealing connections. Installation starts with fitting the Exhaust Manifold before tightening each Exhaust Manifold bolt to 15 nm (11 ft-lbs in the first step followed by 25 Nm (18 ft-lbs in the second step). Secure the manifold by placing the oil level indicator tube in position before uniting the Catalytic Converter with the Exhaust Manifold followed by reinstallation of the engine cover.