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Engine - GM (12491873)

  • $2,591.91
  • $72.57 (3% off)
  • $2,519.34
  • $200.00

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Buick, GMC, Cadillac, Hummer, Saturn, Oldsmobile, Pontiac, Chevrolet Parts
  • GM
  • 12491873
  • Engine
Manufacturer Warranty Minimum of 12 Months
Guaranteed Fitment Always the correct parts
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In-House Experts We know our products

Product Details

  • Remanufactured Engine
  • Regardless of whether you drive an Alero, Monte Carlo or Grand Am, you rely on your vehicle for more than basic transportation. You need a car you can rely on, and this one has never let you down. Unfortunately, the miles are starting to add up. It won’t be long before you have to start spending money on maintenance or repairs. 

    If you aren’t ready to buy a new car, put a new engine into the one you have. Buy part #12491873 replacement motor for your GM. Exact fitments are listed below. This is a 3.4L V6 that replaces factory 3.1L and 3.4L engines.  You get the block, piston and rods, crankshaft, crankshaft bearings, rod bearings and the rear seal.

    If you have high mileage on your car, here are some symptoms of a failing engine:

    • - Knocking or tapping under the hood
    • - Oil in your air cleaner or radiator
    • - Excessive smoke from the exhaust

    This is replacement engine from General Motors and is tested to meet or exceed GM OEM standards. It comes with a warranty. We’ve been selling genuine OEM GM replacement motors for years here at, so we know our engines.  Our experienced parts staff can answer any questions you might have, so feel free to call us. You get free shipping on powertrain parts when you order from us. Enjoy your GM car for a few more years – order your 3.4L engine now.

  • Includes Block, Pistons & Rods, Crankshaft, Crankshaft Bearings, Rod Bearings & Rear Seal.
  • 3.1L, 3.4L.
  • GM is one of the leaders when it comes to cranking out quality made cars, trucks and SUVs. None of that changes when it comes to OEM parts and accessories on GM Parts Online. Keep you car running GM new with OEM affordable parts and accessories with GM Parts Online. 

This Part Fits

Year Make Model Make Model Year Body & Trim Engine & Transmission
2003 Chevrolet Impala Chevrolet Impala 2003 Base 3.4L V6 - Gas
2003 Chevrolet Monte Carlo Chevrolet Monte Carlo 2003 LS, LS Competition, LS Sport 3.4L V6 - Gas
2004 Oldsmobile Alero Oldsmobile Alero 2004 GL, GLS 3.4L V6 - Gas
2003 Oldsmobile Alero Oldsmobile Alero 2003 GL, GLS 3.4L V6 - Gas
2005 Pontiac Grand Am Pontiac Grand Am 2005 GT, GT1, SE 3.4L V6 - Gas
2004 Pontiac Grand Am Pontiac Grand Am 2004 GT, GT1, SE, SE1, SE2 3.4L V6 - Gas
2003 Pontiac Grand Am Pontiac Grand Am 2003 GT, GT1, SE, SE1, SE2 3.4L V6 - Gas

GM Parts Online

When it comes to serving our customers, our staff has over 250 years of combined GM parts experience to serve you. Whether you’re looking for a radiator for your GMC pickup or a part for discontinued brands like Pontiac or Saturn, we’ve got the expertise to find the part and get it ready to ship. If you have a question, a problem, or just need help looking up a part, please call.

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