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Sierra 18-1957-2 Exhaust Manifold for MerCruiser GM Big Block V8

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

118-1957-2
06/03/2036 4:15 PM
Sale Price

$258.00

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-1957-2 is a heavy-duty cast iron exhaust manifold designed as a direct replacement for MerCruiser GM Big Block V8 marine engines. This manifold fits MerCruiser GM 7.4L & 8.2L CID marine engines and is compatible with Mercruiser 330, 340, & 454 Magnum model engines.

Key Features:

  • Interchangeable between port and starboard side for flexible installation
  • Heavy duty cast iron construction with black painted finish
  • Ideally suited for freshwater applications
  • Replaces most Mercruiser GM/Chevy V8 Big Block center rise manifolds
  • Includes all gaskets, short riser studs, drain elbow, and plugs

What's Included:

  • Manifold and riser gasket
  • Bottom water fitting with built-in drain
  • All pipe plugs and mounting gasket

Replaces OEM Part Numbers: Mercruiser 89011A8, 807078A2, 807078A4, 807078A6, 807078T09, 807078T10; Mallory 9-40506; Osco 9011A; Sierra 18-1957, 18-1957-1. Also replaces select Barr, GLM, Mallory & Mercruiser Sterndrive manifolds.

This complete manifold kit provides everything needed for a professional exhaust manifold replacement on MerCruiser Big Block V8 engines. Note: Manifold mounting kit (P/N 18-8532) sold separately.

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Easy to order and shipping was fast

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Excellent

Received in timely manner as ordered. The product is as described. The cheapest Monroe reflex shocks for my Jeep in the entire internet. Very pleased. Many thanks.

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