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HP/Liter/CID/Model Year Exhaust Manifold
5.0 1988 18-1902
350 King Cobra 1988 18-1902
5.0 1988 18-1903
350 King Cobra 1988 18-1903
5.7 1988 18-1902
350 King Cobra 1988 18-1902
5.7 1988 18-1903
350 King Cobra 1988 18-1903
5.0 Liter 1987 18-1902
5.0 Liter 1987 18-1903
5.7 Liter 1987 18-1902
5.7 Liter 1987 18-1903
5.0 Liter 1986 18-1902
5.0 Liter 1986 18-1903
5.7 Liter 1986 18-1902
5.7 Liter 1986 18-1903
5.0 Liter 1985 18-1902
5.0 Liter 1985 18-1903
5.7 Liter 1985 18-1902
5.7 Liter 1985 18-1903
5.0 Liter 1984 18-1902
5.0 Liter 1984 18-1903
5.7 Liter 1984 18-1902
5.7 Liter 1984 18-1903
5.0 Liter 1983 18-1902
5.0 Liter 1983 18-1903
5.7 Liter 1983 18-1902
5.7 Liter 1983 18-1903
5.0 Liter 1982 18-1902
5.0 Liter 1982 18-1903
5.7 Liter 1982 18-1902
5.7 Liter 1982 18-1903
800 Series, 200 1981 18-1902
800 Series, 230 1981 18-1902
800 Series, 260 1981 18-1902
800 Series, 200 1981 18-1903
800 Series, 230 1981 18-1903
800 Series, 260 1981 18-1903
800 Series, 185-260 1980 18-1902
800 Series, 185-260 1980 18-1903
800 Series, 185-230 1979 18-1902
800 Series, 185-230 1979 18-1903
800 Series, 260 1979 18-1902
800 Series, 260 1979 18-1903
800 Series, 185-225 1978 18-1902
800 Series, 185-225 1978 18-1903
175-235 1976 18-1904
175-235 1975 18-1904
170 1974 18-1904
190 1974 18-1904
HP/Liter/CID/Model Year Exhaust Manifold

omc sterndrive/cobra exhaust manifold exploded view-sierra 18-1902 manifold

Sierra 18-1902 Manifold
Part # 18-1902
Our Price: $202.99
Compare at $239.00



V-8 Starboard Side
Fits most GM V-8 small blocks with end riser
Use with: Mounting Kit 18-8502

Replaces OEM part #

  • OMC 912441

omc sterndrive/cobra exhaust manifold exploded view-sierra 18-1903 manifold

Sierra 18-1903 Manifold
Part # 18-1903
Our Price: $202.99
Compare at $239.00



Replaces OEM part #

  • OMC 912442 V-8 Port side
    Fist most GM V-8 small blocks with end riser
    Use with: mounting Kit: 18-8502

omc sterndrive/cobra exhaust manifolds-sierra 18-1904 manifold

Sierra 18-1904 Manifold
Part # 18-1904
Our Price: $453.99
Compare at $534.00



Port and Starboard
Fits most Ford V-8 302 & 315 W with end riser
Use with: Exhaust Manifold Gasket: 18-0183 or 18-2896

  • Replaces O.E.part #

  • OMC 980959 V-8, either side

    sierra products-sierra 18-1986  manifold

    Sierra 18-1986 Manifold
    Part # 18-1986
    Our Price: $198.99
    Compare at $234.00



    Port and Starboard
    For:

    • GM Small Block V8 305-350 ci
    • 5.0L & 5.7L GM (New Style)

    Use with:
    • Exhaust Manifold Gasket: 18-2949
    • Mounting Kit:18-8550

    Replaces OEM part #
    • OMC 3852374-2
    • OMC 3857723
    • VOLVO 3852374-2
    • VOLVO 3857723

    universal inboard exhaust manifold exploded view-sierra 18-1898  manifold

    Our Price: $245.99
    Compare at $289.00



    Port or Starboard
    Fits 454 cu. in. GM big block V8 engines
    Use with: Exhaust Gasket: 18-0418
    Riser Gasket: 18-2854 open or 18-0476 blocked

    Replaces OEM part #

    • BARR CHVA-1-84
    • MARINE POWER 0991-110

    universal inboard exhaust manifold exploded view-sierra 18-1997-1  exhaust manifold

    Our Price: $205.99
    Compare at $244.00



    Universal Center Riser Manifold
    Port or Starboard
    Fits:

    • GM 283, 305, 307, and 350 CID engines
    • Chriscraft 283, 302, 307 and 350 CID engines
    • Crusader 283 and 327 CID engines thru 1964; 305, 307 and 350 CID engines 1965 and later
    • Daytona 200-283 and 300-327
    • Flagship 283, 327 and 350 CID engines
    • Pacer 305, 307 and 350 CID engines 1965 and later
    • Mercury 190, 198, 225, 250, 270, 228, 898, 260, 255 and 280 models
    • OMC 283, 305, 307 and 350 CID engines 1968-1980
    • Volvo 307 and 350 CID engines
    Use 18-0604 Exhaust Manifold Gasket Set

    Replaces OEM part #
    • BARR CHV-1-83

    universal inboard exhaust manifold exploded view-sierra 18-1998-1  exhaust manifold

    Our Price: $205.99
    Compare at $244.00



    Port or Starboard
    Universal Center Riser Manifold

    Fits: Ford 302 and 351 CID engines
    Crusader 302 and 351 CID engines
    Interceptor 221, 260, and 289 cid engines
    Commander, Mercury, OMC, Palmer, Pleasurecraft & Waukesha

    Comes with: 18-4363 mounting package
    Use with: Exhaust Manifold Gasket Set 18-0603

    Replaces OEM part #

    • BARR FM-1-83

    Sierra

    This product typically leaves our warehouse in 1 business day.

    To determine the shipping cost and estimated delivery date for this item click Add to Cart, then click Calculate Shipping inside your shopping cart.

    General Policy

    We work hard to provide you with the best value in product prices and shipping charges, and to get your order to you in a timely, safe, and convenient manner. Internet sales involve the cost of getting the product to you, and shipping carriers base that cost on the size and weight of the package, plus the distance the package travels from our warehouse to your door. We keep our product prices low, negotiate low shipping charges from our carriers and pass those savings on to you, and we don't charge sales tax (except for residents of Utah), so your order from iboats.com is the best value for all your boating needs.

    Our standard shipping method is UPS ground, which typically takes 2-5 additional transit days after the order has left our warehouse, depending on your delivery address. We also offer other shipping options, including expedited delivery, and the actual delivery date will depend on the shipping options you choose.

    Shipping to Canada

    Most products sold by iboats.com can be purchased and shipped to Canada. Some restrictions apply to certain items, such as hazardous materials, over-weight products, and the method of shipping. Available product lines, shipping rates and fees may vary depending on the delivery address for your order.

    Currently, iboats.com offers ground shipping to all Canada provinces. Our Canadian brokerage service accelerates your orders through the Customs clearance process and facilitates the delivery of your order through Canada Post or the best method based on your shipping address. We do not currently offer expedited shipping methods to Canada.

    At iboats.com we want to simplify your transaction and give you a pleasing purchasing experience so you'll come shop with us again and again. We therefore calculate all the duties, taxes, and other fees specific to Canadian orders and show you the total landed cost of getting the order to your door. There are no hidden fees and will be no surprise COD charges when the package is delivered to you.

    Order History & Tracking

    We provide several methods to track your order and keep you informed of your order status and expected delivery date. After completing an iboats.com purchase transaction, an account will automatically be created for your provided email address. You'll receive an email from iboats.com Customer Service informing you of your new User Account and the many benefits it provides. If you don't wish to have an iboats.com Account with password, do nothing and your account won't be registered; however, you can respond to the instructions in the email and easily register your account and setup a password. This will allow you to sign in to your account by choosing the Order Status link from any iboats.com page, where you can browse your order history and track the status of all your orders - tracking numbers are displayed that link to the delivery carrier's tracking webpage.

    If you have provided your email address during checkout, we will also email you your invoice, which includes a link for tracking your order and viewing the current status of your order. Refer to your invoice email and tracking link any time you wish to track the status of your order

    Friendly Return Policy

    • If the merchandise you received was defective, damaged, or an error was made by iboats.com, simply return the merchandise within 30 days of the original shipping date for a full refund.
    • See the specific requirements and instructions below for United States or Canadian orders.

    Returns for U.S. Customers

    We want to make it as easy as possible for you to return an unwanted item; after all, we want you to return again and again as a satisfied iboats.com customer, and to also continue recommending us to your friends.

    As mentioned above, if the merchandise you received was defective, damaged, or an error was made by iboats.com, simply return the merchandise within 30 days of the original shipping date for a full refund. Merchandise must still be in brand-new, unused condition with all original packaging in good condition; plus parts, accessories, manuals, and/or warranty cards included. Please note that all return merchandise must be accompanied by an RA (Return Authorization) number issued by iboats.com. To receive your RA number simply call our Returns Department toll-free at 1-800-914-1123 or email us at returns@iboats.com.

    If for some reason you need to return merchandise for reasons other than those mentioned above, follow the same procedures, obtaining an RA number from iboats.com, within 30 days of the original shipping date. Please note that there may be restocking fees, shipping costs, or product change order costs associated with some returns. Feel free to check with the iboats.com Returns Department for specific terms, conditions, and eligibility.

    Returns for Canadian Customers

    We request that all Canadian customers verify and re-check that the products you are ordering are what you want and are correct for your application or intended use. iboats.com does not accept any return merchandise on Canadian orders, unless the merchandise you received was defective, damaged, or an error was made by iboats.com. In such cases, return the merchandise within 30 days of the original shipping date for a full refund, following the procedures below.

    Canadian orders involve many additional costs dealing with Customs, Provincial taxes, brokerage fees, and more, making product returns complicated and very expensive and costly for both the customer and iboats.com. Again, help us serve you best by verifying that the products you are ordering are what you want so we don't have any costly returns or have to deny a return.

    If a return meets the criteria mentioned above, merchandise must still be in brand-new, unused condition with all original packaging in good condition; all parts, accessories, manuals, and/or warranty cards included. Please note that all return merchandise must be accompanied by an RA (Return Authorization) number issued by iboats.com. To receive your RA number call our Customer Service Department toll-free at 1-800-914-1123, Tuesday-Friday, 10am-7pm EST, or email us at returns@iboats.com. We will provide further details on where and how to mail the merchandise. Please note that returns sent from rural Canadian addresses may take up to five weeks to process after the package is mailed.

    Do you need Professional Installation? iboats.com has teamed with a national network of independent installers that are ready to handle your installation needs.
    Find your local Amtech dealer:
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