-17% sale
Sierra Qualifies for Free Shipping Sierra Exhaust Manifold Gasket 2-pk #18-2902-1-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket 2-pk #18-2902-1-9 $31.59 $37.70
Sierra 18-2902-1-9 Engine GasketsSierra Exhaust Manifold Gasket 2-pk #18-2902-1-9Normalized SKU: 18290219UPC Code: 808282369156
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket 2-pk #18-2909-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket 2-pk #18-2909-9 $20.31 $24.24
Sierra 18-2909-9 Engine GasketsExhaust Manifold Gasket (Priced Per Pkg of 2)Sierra Exhaust Manifold Gasket (Priced Per Pkg of 2) #18-2909-9Normalized SKU: 1829099UPC Code: 808282164126
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket 2-pk #18-2949-9
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket 2-pk #18-2949-9 $30.60 $36.52
Sierra 18-2949-9 Engine GasketsExhaust Manifold Gasket (Priced Per Pkg of 2)Sierra Exhaust Manifold Gasket (Priced Per Pkg of 2) #18-2949-9Normalized SKU: 1829499UPC Code: 808282164355
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-0601
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-0601 $42.11 $50.53
Sierra 18-0601 Engine GasketsExhaust Manifold Gasket SetSierra Exhaust Manifold Gasket Set #18-0601Normalized SKU: 180601UPC Code: 808282233990
Sold out -17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-0602
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-0602 $48.57 $58.28
Sierra 18-0602 Engine Gaskets Exhaust Manifold Gasket Set Fits: "CH" Model Small Block V8 305 & 350 CID (5.7L) Contains: 18-2949, 18-0309-1, and 18-0306-1 Superseding to 18-0602-1 Normalized SKU: 180602UPC Code: 808282234003
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-0603
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-0603 $40.40 $48.47
Sierra 18-0603 Engine GasketsExhaust Manifold Gasket SetSierra Exhaust Manifold Gasket Set #18-0603Normalized SKU: 180603UPC Code: 808282257408
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-0604
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-0604 $37.18 $44.38
Sierra 18-0604 Engine GasketsExhaust Manifold Gasket SetSierra Exhaust Manifold Gasket Set #18-0604Normalized SKU: 180604UPC Code: 808282242787
Sold out -17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4346
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4346 $8.26 $9.86
Sierra 18-4346 Engine GasketsExhaust Manifold Gasket SetOEM Interchange:CHRYSLER INBOARD: 3745220Sierra Exhaust Manifold Gasket Set #18-4346Normalized SKU: 184346UPC Code: 808282237738
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4347-1
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4347-1 $29.76 $35.52
Sierra 18-4347-1 Engine GasketsExhaust Manifold Gasket SetSierra Exhaust Manifold Gasket Set #18-4347-1Normalized SKU: 1843471UPC Code: 808282236731
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4348
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4348 $52.46 $62.95
Sierra 18-4348 Engine GasketsExhaust Manifold Gasket SetSierra Exhaust Manifold Gasket Set #18-4348Normalized SKU: 184348UPC Code: 030999755964
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4349
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4349 $37.20 $44.40
Sierra 18-4349 Engine GasketsExhaust Manifold Gasket SetSierra Exhaust Manifold Gasket Set #18-4349Normalized SKU: 184349UPC Code: 030999755971
Sold out -22% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4365
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4365 $243.85 $309.70
Sierra 18-4365 Engine GasketsExhaust Manifold Gasket SetOEM Interchange:MERCURY MARINE: 27-801855Sierra Exhaust Manifold Gasket Set #18-4365Normalized SKU: 184365UPC Code: 030999621849
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4367
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4367 $35.67 $42.57
Sierra 18-4367 Engine GasketsExhaust Manifold Gasket SetOEM Interchange:MERCURY MARINE: 27-99777A1Sierra Exhaust Manifold Gasket Set #18-4367Normalized SKU: 184367UPC Code: 030999563309
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4369
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4369 $22.89 $27.32
Sierra 18-4369 Engine GasketsSierra Exhaust Manifold Gasket Set #18-4369Sierra Exhaust Manifold Gasket Set #18-4369Normalized SKU: 184369UPC Code: 030999563323
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4370
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4370 $35.50 $42.37
Sierra 18-4370 Engine GasketsExhaust Manifold Gasket SetSierra Exhaust Manifold Gasket Set #18-4370Normalized SKU: 184370UPC Code: 030999563330
-17% sale
Sierra Exhaust Manifold Gasket Set #18-4371
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4371 $23.08 $27.55
Sierra 18-4371 Engine GasketsExhaust Manifold Gasket SetSierra Exhaust Manifold Gasket Set #18-4371Normalized SKU: 184371UPC Code: 030999563347
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4394
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4394 $30.35 $36.22
Sierra 18-4394 Engine GasketsExhaust Manifold Gasket SetOEM Interchange:MERCURY MARINE: 27-33395A2Sierra Exhaust Manifold Gasket Set #18-4394Normalized SKU: 184394UPC Code: 030999563576
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4395
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4395 $27.88 $33.28
Sierra 18-4395 Engine GasketsExhaust Manifold Gasket SetOEM Interchange:MERCURY MARINE: 27-35898A4Sierra Exhaust Manifold Gasket Set #18-4395Normalized SKU: 184395UPC Code: 030999563583
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4396
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4396 $50.67 $60.80
Sierra 18-4396 Engine GasketsExhaust Manifold Gasket SetOEM Interchange:MERCURY MARINE: 27-46401A1Sierra Exhaust Manifold Gasket Set #18-4396Normalized SKU: 184396UPC Code: 030999563590
-17% sale
Sierra Not Qualified for Free Shipping Sierra Exhaust Manifold Gasket Set #18-4397
00
DAYS 00
HRS 00
MIN 00
SEC
Sierra Sierra Exhaust Manifold Gasket Set #18-4397 $28.68 $34.23
Sierra 18-4397 Engine GasketsExhaust Manifold Gasket SetOEM Interchange:MERCURY MARINE: 27-46820A1Sierra Exhaust Manifold Gasket Set #18-4397Normalized SKU: 184397UPC Code: 030999563606

Frequently Asked Questions

First Choice Marine is an online marine retailer carrying a diverse line of marine parts and accessories and related items from industry-respected and demanded manufacturers and suppliers. Through our diverse distributor network, we are able to access over 150,000 items, including our current site inventory, new products being added, and special order items. If you need it on your boat... we are your one-stop shop!

Yes, we offer FREE Shipping on most orders over $149 to US-48*.

Each product displays a shipping status message, just above the item price. Below is the meaning for each of these codes.

  • Qualifies for Free Shipping: This item qualifies for free shipping when the order is $149+
  • Qualifies for Free Ground Shipping: This item qualifies for free ground shipping when the order is $149+.
  • Oversized - Not Qualified for Free Shipping: This item is too large/heavy to qualify for free shipping
  • Hazardous Item - Not Qualified for Free Shipping: This item is hazardous and does not qualify for free shipping
  • Truck Freight - Not Qualified for Free Shipping: This item has to be shipped via truck freight. Please contact us for a quote
  • In-Store Pickup Only: This item can only be picked up in our Grain Valley, MO retail store

Below the price of the item, on the product page, there is a message indicating the availability of the product.

The quantity on hand is updated as inventory events happen and matches what we have available. If you have urgent needs and we are close to what you need, contact us, and we can confirm stock.

We offer a hassle-free return policy. If you're not completely satisfied with your purchase, you can return it within 30 days for a full refund or exchange.

If you need to return an item, please follow the guidelines here so we can process a prompt refund and assist you in finding the correct item.

Free Shipping

On most orders $149+ to the continental 48 US states.

Secure Shopping

Fast, secure checkout with a variety of payment methods.

Shop with confidence

25+ years serving the marine industry.

Support center

Need help? Contact us via live chat, phone, or email.

© 2026 First Choice Marine.