Build your own: 5.7L Pre-Vortec (1987-1995) Marine Engine



Short description:

Build your own 5.7L Pre-Vortec Marine Engine! Choose which accessories you want installed on your engine.

New 5.7L Pre-Vortec Marine Base Engine (replaces years 1987-1995)

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 1987-1995 using a 12 bolt intake manifold.

We offer this “build your own” marine engine option for people who are not interested in one of our preselected extended base engine options.


How to build your own 5.7L Pre-Vortec Engine:

Start: we’ll start with the base engine (longblock with valve covers, timing cover, oil pan, and harmonic balancer)

Next: select from a list of components from the drop down options. The price will change with each option selected or deselected.

Next: click the “Add to Cart” button when you’re ready to purchase the engine.

Finalize: you’ll get a confirmation email when you’re done purchasing your custom built engine. Please allow 3-5 business days for the engine to be assembled with your selected accessories. We’ll then ship your engine crated to the address provided by truck freight.

Questions? Give us a call at 888-364-4537


  • 1 Piece Rear Main Seal
  • Standard rotation
  • Intake Manifold: 12 bolt
  • Cylinders: 90 Degree V8 Cylinder
  • Hydralic Roller Camshaft
  • Composition Ratio: 9.4:1
  • Bore: Standard
  • Firing Order: 1-8-4-3-6-5-7-2
  • Oil Pan Capacity: 5.5 quarts
  • Oil Type: SAE 15W40 Pennzoil Marine
  • Horsepower: 270 hp @ 4800 RPM (4bbl carbureted)
  • Torque: 340 lb-ft @ 3200 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).


About Our Accessories

We use only engine accessories that we have tested here at our facility. No one wants accessories installed on an engine that won’t hold up in the long run. It’s just a headache for you and us alike.

Accessories will vary by brand depending on what options you choose when building your engine. Our carburetors are either Edelbrock or Holley, or intakes are either Edelbrock, Indmar or OE. Ignition systems are Delco. Exhaust setups are either GLM or BARR.

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 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 with the following information:

  • item part #
  • destination country and postal code

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




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