My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-4387 Overhaul Gasket Set for GM 454 7.4L Big Block Marine Engines

Manufacturer

Picture for manufacturer Sierra

Part Number

18-4387
11 reviews
Sale Price

$369.99

1 left at this price

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-4387 Overhaul Gasket Set is a comprehensive engine rebuild solution engineered for GM 454 (7.4L) CID oval port big block inboard marine engines. This complete set delivers all the gaskets needed for a thorough engine overhaul, restoring proper sealing and performance to your marine powerplant.

Key Features:

  • Complete overhaul gasket set for GM 454 (7.4L) CID oval port engines
  • Includes Sierra 18-3877 head gasket
  • Manufactured to precise OEM specifications for reliable sealing performance
  • Constructed from high-grade materials for exceptional durability and service life
  • Incorporates the latest manufacturing technologies and design innovations for accurate O.E. fitment

Cross-Reference Part Numbers:

  • Replaces MerCruiser Stern Drive: 27-801853
  • Replaces GLM: 39020
  • Replaces Mallory: 9-61102

Sierra International is a trusted name in marine engine parts, and this overhaul gasket set reflects their commitment to quality. Whether performing a full engine rebuild or a major top-end overhaul, the Sierra 18-4387 provides the complete sealing package needed to get your big block back on the water with confidence.

amazing

good so far.

Thanks

So far so good

Awesome

Great prices and fast shipping

easy

Free shipping and a great price.

Fast Shipping, Great price, Parts were well packed

I was hesitant to order from Autoplicity due to the perception that the price was too good to be real (and not some scam). However, I read a few reviews on the internet and decided to take a chance. Once I placed my order I was sent a tracking number and received my car parts within 2 weeks. I was happy that I got the parts I ordered and the price was really low. Simple and quick.

Great prices

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy