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New 5.7L Pre-Vortec (1965-86) Marine Base Engine


List price: $3,495.00  

Short description:

New 5.7L Pre-Vortec Marine Base Engine (replaces years 1965-1986)


Shipping calculated at checkout.


New 5.7L Pre-Vortec Marine Base Engine (replaces years 1965-1986)

This is a brand new 5.7L/350 c.i. Vortec Marine Base Engine right out of GM Marine. This engine will replace those 5.7L marine engines used in Mercruiser, Volvo Penta, OMC, Crusader, Indmar and other applications between the years 1965-1986 that utilized the 12-bolt intake manifold, has perimeter bolt valve covers, and has a 2 piece rear main seal.

This is a perfect stock replacement for those engines that have suffered from a cracked block due to improper winterization or another type of engine failure.

If your engine is using a mechanical fuel pump, you will need to convert to an electric fuel pump to utilize this new pre-vortec engine.

This "Base Engine" Package includes:

  • new engine block, heads and all internal components
  • valve covers
  • timing cover
  • oil pan


  • 2 Piece Rear Main Seal
  • 4 Bolt Main
  • Standard rotation (opposite rotation available for $300 extra)
  • Intake Manifold: 12 bolt
  • Cylinders: 90 Degree V8 Cylinder
  • Bore: Standard
  • Firing Order: 1-8-4-3-6-5-7-2
  • Oil Type: SAE 15W40 Pennzoil Marine
  • Horsepower: 260 hp @ 4400 RPM (4bbl carbureted)
  • Torque: 350 lb-ft @ 3600 RPM


About Our Marine Base Engines

GM has been at the forefront of marine engine design for over 40 years, introducing new technologies that have improved performance, fuel efficiency, emissions, and overall customer satisfaction. Technologies like Variable Valve Timing (VVT), Active Fuel Management (AFM), E85 FlexFuel capable, Returnless Fuel Injection, Electronic Throttle Control, Advanced Ignition systems, Direct Injection (DI), and charged air systems have been introduced on our world-class cars and trucks and could be considered for marine engine applications, as well.

Today, GM provides the most complete marine engine portfolio to all of the major marinizers in North America, with a major share of the gasoline stern drive and inboard marine engine market.

The same engine that powers your GM truck or SUV is specialized to create the unparalleled performance you can expect in a GM marine engine.

GM Powertrain has designed a number of important features into its marine engines, such as corrosion-resistant alloys, engine oil sealing system, marine-specific camshaft designs for some applications, and cooling systems that are compatible with both salt and fresh water environments.

Because GM Powertrain knows the tremendous demand put on engines in the marine environment, GM marine engines are "tested tough" by being run at extensive wide-open throttle conditions, under load, when subject to the Marine GED Test Schedule (Global Engine Durability).


Our Shipping Policy


We ship our engines all over the world. In the domestic US, we ship via FedEx Freight, although on occasion other freight carriers may be used. We usually need a 1 business day handling time on our engines. Please give us a call at 888-364-4537 or by email at info@marineengines4less.com to request a shipping quote.

Our standard shipping cost is shipping to a business location or to the closest freight terminal to you. A list of Fedex Freight terminals can be found here

Residential Delivery with liftgate adds $75 to the shipping cost.


Our engines have been shipped all over the world. We usually ship via ocean and air freight depending on how much of a rush our customers are in. To request a shipping quote please email us at info@marineengines4less.com with the following information:

  • item part #
  • desination country and postal code

We'll get back to you quickly with a shipping quote!

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