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Model/ HP Cyl. Beg. S/N End. S/N Head Gasket Mallory Gasket, Cylinder Head
4 HP (4 stroke) 1 OR000001 & UP 18-3844  
5 HP (4 stroke) 1 OR000001 & UP 18-3844  
6 HP (4 stroke) 1 OR000001 & UP 18-3844  
25 HP (4 stroke) 2 OG760300 & UP 18-3846  
40 HP (4 stroke) 4 OG760300 & UP 18-3845  
45 HP (4 stroke) 4 OG760300 & UP 18-3845  
50 HP (4 stroke) 4 OG760300 & UP 18-3845  
105 JET 6 D082000 & UP 18-3864 9-63854
V-135 V-6 A904646 C239552 18-3863 9-63855
V-135 V-6 C239553 G960499 18-3861 9-63851
140 JET V-6 D082000 G960499 18-3864 9-63854
V-150 V-6 6042946 C239552 18-3863 9-63855
V-150 V-6 C239553 G960499 18-3861 9-63851
V-150 XR4 MAGIII V-6 B242885 C239552 18-3862 9-63853
V-150 XR4 V-6 C239553 D081999 18-3871 9-63856
V-150 EFI XR6MAGIII V-6 D082000 G960499 18-3864 9-63854
150 MAR V-6 6038681 C239553 18-3863 9-63855
150 MAR V-6 C239554 & UP 18-3861 9-63851
V-175 V-6 6618751 C239552 18-3862 9-63853
V-175 V-6 C239553 D081999 18-3871 9-63856
V-175 V-6 D082000 G960499 18-3864 9-63854
V-175 XRI EFI V-6 D000750 D081999 18-3871 9-63856
V-175 XRI EFI V-6 D000750 D081999 18-3864 9-63854
V-175 XRI EFI V-6 D082000 G303045 18-3864 9-63854
V-200,200,2000 V-6 4839034 6073191 18-3872 9-63852
V-200 V-6 6073192 6203990 18-3872 9-63852
V-200 (EFI) V-6 OC100861 OC291519 18-3862 9-63853
V-200 (EFI) V-6 OC291520 OG960499 18-3862 9-63853
V-200 (2.4L) V-6 6203991 C291519 18-3862 9-63853
V-200 (2.5L) V-6 C291520 & UP 18-3864 9-63854
V-200 XRI EFI V-6 C100861 C291519 18-3862 9-63853
V-200 XRI EFI V-6 C291520 & UP 18-3864(2) 9-63854
V-220 V-6 B117316 & UP 18-3862 9-63853
V-225 V-6 5628028 D280812 18-3872 9-63852
V-225 V-6 OD280813 & UP 18-7400  
V-225 SEA PRO V-6 OG245605 OT408999 18-7400  
V-225 EFI (3.0L) V-6 OG129222 OG760299 18-7400  
V-250 EFI (3.0L) V-6 OG129222 OT408999 18-7400  
Model/ HP Cyl. Beg. S/N End. S/N Head Gasket Mallory Gasket, Cylinder Head
Notes:
(2) : 2 head gaskets required

yamaha outboard head gaskets

Our Price: $26.99
Compare at $31.99



Replaces OEM part #

  • MERCURY MARINE 27-84733M
  • MERCURY MARINE 27-19138M
  • MERCURY MARINE 27-19138
  • YAMAHA 689-W0001-A1-00
  • YAMAHA 689-11181-02-00
    For: Mercury/Mariner Model 30A; S/N Code 689

mercury head gaskets-sierra 18-3827 head gasket

Our Price: $17.99
Compare at $21.49



Replaces OEM part #

  • MERCURY MARINE 27-8254821
  • YAMAHA 6G8-11181-A1-00
  • YAMAHA 6G8-11181-00-00

  • For: Mercury/Mariner 8, 9.9 HP 4-Stroke

mercury head gaskets-sierra 18-3828

Our Price: $13.99
Compare at $15.99



Replaces OEM part #

  • MERCURY MARINE 27-98990M
  • MERCURY MARINE 27-83899M
  • MERCURY MARINE 27-18937M
  • MERCURY MARINE 27-18937
  • YAMAHA 6E7-11181-A1-00
  • YAMAHA 6E7-11181-00-00
    For: Mercury/Mariner Model 9.9C;S/N Code 682 & Model 15C, S/N Code 684

mercury head gaskets-sierra 18-3844 head gasket

Our Price: $16.99
Compare at $19.49



Replaces OEM part #

  • MERCURY MARINE 27-803508

  • For: Mercury/Mariner 4-Stroke O/B's, 4/5/6 HP S/N OR000001 & up

mercury head gaskets-sierra 18-3845 head gasket

Our Price: $52.99
Compare at $61.49



Replaces OEM part #

  • MERCURY MARINE 27-825032

  • For: Mercury/Mariner 4-Strokes O/B's, 40/45/50 HP S/N OG760300 & up

mercury head gaskets-sierra 18-3846 head gasket

Our Price: $34.99
Compare at $41.99



Replaces OEM part #

  • MERCURY MARINE 23-830270

  • For: Mercury/Mariner 4-Stroke O/B's, 25 HP S/N OG760300 & up

mercury head gaskets-sierra 18-3861 head gasket

Our Price: $15.99
Compare at $17.69



Replaces OEM part #

  • MERCURY MARINE 27-18785-1

  • For: Mercury/Mariner Model 135,150,and XR4

mercury head gaskets-sierra 18-3862 head gasket

Our Price: $19.99
Compare at $22.99



Replaces OEM part #

  • MERCURY MARINE 27-41246-1

  • For: Mercury/Mariner Model 175, 200, XR4

mercury head gaskets-sierra 18-3863 head gasket

Our Price: $19.99
Compare at $22.99



Replaces OEM part #

  • MERCURY MARINE 27-96542-1

  • For Mercury/Mariner Model 150

mercury head gaskets-sierra 18-3864 head gasket

Our Price: $21.99
Compare at $25.99



Replaces OEM part #

  • MERCURY MARINE 27-822844-1

  • For: Mercury/Mariner Model 175, 200 and XR6

mercury head gaskets-sierra 18-3871 head gasket

Our Price: $23.99
Compare at $27.49



Replaces OEM part #

  • MERCURY MARINE 27-18786-1

  • For: Mercury/Mariner Model 175, XR4, Mag 11

mercury head gaskets-sierra 18-3872 head gasket

Our Price: $29.99
Compare at $34.99



Replaces OEM part #

  • MERCURY MARINE 27-41245-1

  • For:Mercury/Mariner 200 and 225 HP

mercury head gaskets-sierra 18-0372 20 hp cyl. block gasket

Our Price: $3.99
Compare at $4.49



Replaces OEM part #

  • MERCURY MARINE 27-78410

mercury head gaskets-sierra 18-2500 exhaust cover  gasket 80 hp

Our Price: $8.99
Compare at $9.49



Replaces OEM part #

  • MERCURY MARINE 27-85493
Pkg. of 2

mercury head gaskets-sierra 18-2504 block cover gasket  3 cyl.

Our Price: $7.99
Compare at $8.49



Replaces OEM part #

  • MERCURY MARINE 27-88449
  • Pkg. of 2

mercury head gaskets-sierra 18-2505 cyl. block   gasket  75-80 hp

Our Price: $12.99
Compare at $14.99



Replaces OEM part #

  • MERCURY MARINE 27-96171-1
  • Pkg. of 2

mercury head gaskets-sierra 18-2507 cyl. block  gasket 40-50 hp

Our Price: $7.99
Compare at $8.49



Replaces OEM part #

  • MERCURY MARINE 27-85487
  • PKG. of 2

mercury head gaskets-sierra 18-2740 cylinder block gasket

Our Price: $9.99
Compare at $10.99



Replaces OEM part #

  • MERCURY MARINE 27-43005-7
  • For: 65 Jet, 75 HP 3 cyl, 90 HP 3 cyl.

mercury head gaskets-sierra 18-2805 block cover  gasket 35-40 hp

Our Price: $6.99
Compare at $7.49



Replaces OEM part #

  • MERCURY MARINE 27-85490-2
  • Pkg. of 2

mercury head gaskets-sierra 18-2806 cyl. cover  gasket v6

Our Price: $6.99
Compare at $7.99



Replaces OEM part #

  • MERCURY MARINE 27-65788
  • Pkg. of 2

mercury head gaskets-sierra 18-2807 block cover  gasket 90-115 hp

Our Price: $14.99
Compare at $16.99



Replaces OEM part #

  • MERCURY MARINE 27-98185-3
Pkg. of 2

mercury head gaskets-sierra 18-2808 cyl. cover  gasket v6

Our Price: $5.99
Compare at $6.49



Replaces OEM part #

  • MERCURY MARINE 27-96278
  • Pkg. of 2

mercury head gaskets-sierra 18-2809 block cover  gasket 50-60 hp

Our Price: $11.99
Compare at $13.49



Replaces OEM part #

  • MERCURY MARINE 27-43779-2
  • Pkg. of 2

mercury head gaskets-sierra 18-2810 block cover gasket 45-50 hp

Our Price: $10.99
Compare at $12.99



Replaces OEM part #

  • MERCURY MARINE 27-43777-2
  • Pkg. of 2

mercury head gaskets-sierra 18-2837 block cover gasket

Our Price: $3.99
Compare at $4.49



Replaces OEM part #

  • MERCURY MARINE 27-41382
Pkg. of 2

mercury head gaskets-sierra cylinder block gasket

Our Price: $12.99
Compare at $14.99



Part # 18-2943
Replaces OEM part #

  • MERCURY MARINE 27-44328-4
    For: 81 Jet, 100 HP, 115 HP, and 125 HP 4 cyl. outboards

yamaha outboard head gaskets-mallory gasket, cylinder head 9-63964

Our Price: $16.99
Compare at $23.55



Replaces GLM #:34910
Replaces Original Equipment Manufacturer(OEM):Yamaha
Replaces Original Equipment Manufacturer # (OEM #):6G8-11181-A1
Fits Application:9.9 4-stroke

yamaha outboard head gaskets-mallory gasket, cylinder head 9-63962

Our Price: $12.99
Compare at $14.09



Replaces GLM #:33890
Replaces Original Equipment Manufacturer(OEM):Yamaha
Replaces Original Equipment Manufacturer # (OEM #):6E7-11181-A1
Fits Application:9.9/15 88-93

yamaha outboard head gaskets-mallory gasket, cylinder head 9-63960

Our Price: $26.99
Compare at $33.42



Replaces GLM #:33880
Replaces Original Equipment Manufacturer(OEM):Yamaha
Replaces Original Equipment Manufacturer # (OEM #):689-11181-A1
Fits Application:25 84-87, 30 84-86, C30 89-92

Our Price: $22.99
Compare at $30.20



Replaces GLM #:35890
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):27-18786-1
Fits Application:175, XR4, MAG II

mercury/mariner gasket sets-mallory gasket, cylinder head 9-63855

Our Price: $18.99
Compare at $25.97



Replaces GLM #:35880
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):27-96542-1
Fits Application:150

mercury/mariner gasket sets-mallory gasket, cylinder head 9-63854

Our Price: $21.99
Compare at $29.52



Replaces GLM #:35870
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):27-822844-1
Fits Application:175, 20, XR6

mercury/mariner gasket sets-mallory gasket, cylinder head 9-63853

Our Price: $18.99
Compare at $23.94



Replaces GLM #:35860
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):27-41246-1
Fits Application:175, 200, XR4

mercury/mariner gasket sets-mallory gasket, cylinder head 9-63852

Our Price: $28.99
Compare at $36.00



Replaces GLM #:35900
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):27-41245-1
Fits Application:200, 225

mercury/mariner gasket sets-mallory gasket, cylinder head 9-63851

Our Price: $14.99
Compare at $28.03



Replaces GLM #:35850
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):27-18785-1
Fits Application:135, 150, XR4

mercury/mariner gaskets-mallory gasket, block cover 9-60047

Our Price: $7.99
Compare at $9.15



Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):27-98185-3
Fits Application:90-115 inline 6 cyl

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; afterall, 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.

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