Product Description New exhaust manifold for MerCruiser 330, 340, and 454 Magnum Big Block V8 marine gas engines (GM/Chevrolet). This manifold is a center rise style, will fit either side of the engine, and accepts all original mounting brackets. Comes with gaskets and all necessary plugs. Each purchase is for one manifold. This part is new and high-quality cast iron construction. To determine if this is the correct replacement for you, look on your current part for casting numbers and match them to the cross reference below:

Cross Reference	Part Number
MerCruiser	807078A6, 89011A8, 89011
Osco Motors	9011
Barr Marine	MC-1-89011
Sierra Marine	18-1957-1, 18-1957-2
HGE	7114
Aqua Power	5506
GLM Products	51240
Marine Power	0991-100

About Sierra Sierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of the product against any defects in workmanship and materials.

Shipping and Tracking

• No PO Box : Please use a street address for shipping this item.
• Items ship the same day if purchased on a business day before 11am Pacific Time.
• Faster shipping options are available in the "Shipping and payments" section on this page.
• Tracking is sent via eBay to your email address once an item ships (double-check your spam folder).
• Business days are Monday through Friday, not including holidays.
• Pickup is not available. All items must be shipped.
• Puerto Rico and US protectorates : For an accurate shipping rate please enter the country as United States and use your US zip code.

Tax and VAT

• United States: Sales tax is charged to certain states based on online marketplace laws. This is controlled by eBay. Add this item to your cart to see if tax will be charged.
• International: There will likely be customs duties & taxes (D&T) levied by your government (see below).

International Buyers

• Customs Duties & Taxes (D&T) : Shipping prices do not include duties & taxes. Your country's customs office will asses this at the border, and you may need to pay an invoice before delivery. Every country is different. If you're unsure, research with your custom's office before ordering .
• In some cases eBay collects Tax up front. During eBay checkout, if you see a Tax line item, save your tax receipt from your eBay Purchase History after ordering. Provide that tax receipt when the customs agent contacts you to avoid being double-taxed.
• Items heading outside the USA cannot be used for military or government applications. The seller and marketplace expressly disclaim liability for misuse of its products.
• Items cannot be marked as gift or have a lowered value on the documentation. It is unlawful to forge international documents.

Warranty, Defects, Damage, and Other Problems

• This item has a Limited Lifetime warranty covering any manufacturer defects.
• If your item is defective, incorrect, arrived damaged, is lost, or is missing parts, please send an eBay Message or Email right away. Describe the nature of the problem and its urgency (include pictures if possible). You will be taken care of as quickly as possible and there will never be any additional cost to you.

Normal Returns

• Help us reduce returns: If you are not certain that this item is right, or you have any questions, please send us a message first so we can help. Thank you!
• Normal returns are for items that you no longer want, ordered by mistake, or changed your mind about.
• Items may be returned as long as they are still in new condition with all original components/packaging.
• If an item is marred, dinged up, dirty, missing packaging, or was installed (partially or fully), there might be a restocking fee.
• Please do not return items in used condition!
• To start a return , log in to eBay, go to your Purchase History, and use the Return link next to the transaction. Or follow the instructions in the order confirmation email you received. Be sure to enter an accurate reason and description for the return.

Contact Please read the information above thoroughly before asking a question. Questions are generally answered Monday through Friday, 8am to 4pm PST. All correspondence must be via Email or eBay Message .

• Condition: New
• Brand: Sierra
• Part Number: 18-1957-2
• Manufacturer: Sierra
• Item Weight: 54.9 lbs
• Manufacturer Part Number: 18-1957-2
• UPC: 808282371357
• Country of Manufacture: Taiwan
• Shipping Weight: 55 lbs
• Shipping Dimensions: 21" x 10" x 7"
• Warranty: Limited Lifetime
• Type: Exhaust Manifold
• MPN: 18-1957-2

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