If you are searching for a marine 5.7 long block, note that none of the products listed here is identified as a complete long-block engine. They are replacement parts for certain GM 5.7-liter marine applications. The Weonefit exhaust manifold kit and Gledewen head gasket set address engine repair, while the ANDO RACING fuel pump serves fuel delivery. Use the comparison below to identify relevant components, then verify your engine’s year, configuration, and original part numbers before ordering.
| Product | Best For | What It Is |
|---|---|---|
| Weonefit Exhaust Manifold Kit | Exhaust-system replacement | Two marine exhaust manifolds |
| Gledewen Head Gasket Set | Head-gasket service | 5.7L engine gasket set |
| ANDO RACING Fuel Pump | Mechanical fuel-pump replacement | Marine fuel pump |
| CFR Performance Oil Pan | Oil-pan replacement | Steel, five-quart pan |
| Technical Precision 5.7L EFI Listing | EFI MIE application research | Replacement listing; item details are limited |
Weonefit Marine Exhaust Manifold Kit
This two-piece exhaust manifold replacement is listed for MerCruiser GM 5.0-liter and 5.7-liter engines, as well as specified MCM/MIE GM V8 applications. The stated coverage includes 305, 350, and 377 CID engines from listed model years spanning 1983 to 2002, with an application note for some early-1980s-to-2002 5.0L and 5.7L engines.
Best for: Owners confirming a compatible MerCruiser small-block application who need exhaust manifold replacements. The listing describes water jackets intended to support water flow and engine cooling. Check the included part-number references against the parts being replaced.
Limitation: The broad application range does not establish fitment for every 5.7-liter marine engine. Verify model year and engine configuration before purchase.
Gledewen 5.7L Head Gasket Set
This head gasket set is listed for 350 CID MerCruiser, Volvo Penta, Crusader, and GM Marine 5.7L V8 engines. The product description says the gaskets are designed to fit cylinder-head and block surfaces and resist corrosion, heat, and pressure.
Best for: A buyer performing compatible 5.7L cylinder-head service who needs a gasket set rather than a complete engine. It is relevant to long-block repairs because head gaskets seal the joint between the cylinder heads and engine block.
Limitation: The supplied details do not list every gasket included in the set or provide a complete year-by-year application chart. Confirm contents and fitment for your exact engine before ordering.
ANDO RACING Mechanical Marine Fuel Pump
This mechanical marine fuel pump is listed for several GM small-block and marine V8 applications, including 350/5.7L engines. The fitment details name certain OMC, Volvo Penta, and MerCruiser applications and model-year ranges. Listed replacement references include Volvo Penta 3855276 and 981650, OMC 3853792, and Sierra 18-7268.
Best for: Owners replacing a mechanical pump on a specifically listed compatible 5.7L application. The stated function is to deliver fuel steadily to the engine.
Limitation: The listing covers multiple displacements and years, so a 5.7L designation alone is not enough to confirm fit. Compare the original pump number and application details before ordering.
CFR Performance Marine And Truck Oil Pan
This steel oil pan is listed for MerCruiser 5.0L and 5.7L V8 engines and selected Chevy small-block configurations. Its stated specifications include a five-quart stock-volume capacity and 12mm bolt holes. The description identifies it for 1996-and-newer marine engines using a one-piece rear main seal and provides MerCruiser cross-references 808588, 809910, and 889501T.
Best for: A buyer replacing an oil pan on a compatible engine who can verify the rear-main-seal design and OEM reference numbers.
Limitation: The one-piece rear main seal requirement narrows the applications. Do not assume it fits an earlier 5.7L engine without checking its configuration.
Technical Precision 5.7L EFI MIE Listing
This listing names a MerCruiser 5.7L EFI (GEN+) MIE marine engine and describes it as a replacement for all models of the stated GM 5.7L, 350-cubic-inch, eight-cylinder application. The provided details say one unit is sold per sale, but they do not clearly describe the item’s exact contents or establish that it is a complete long block.
Best for: Buyers researching a replacement associated with the specified EFI MIE application who can obtain clarification about what the listing supplies.
Limitation: The product information is too limited to confirm whether this is an engine assembly, a component, or a complete long block. Confirm the exact part and included components with the seller before purchasing.
Buying Guide: How To Choose Marine 5.7L Parts
Are you buying a complete long block or an individual part?
A long block generally refers to an engine assembly built around the block, cylinder heads, and internal components; it is not the same as a fuel pump, gasket set, manifold, or oil pan. The supplied product details do not clearly identify a complete long block. Before ordering an engine, ask for a written description of what is included, such as the block, heads, valvetrain, and oil pan.
Which engine details should you verify?
Record the engine make, displacement, model year, marine brand, and EFI or carbureted configuration. Check the engine identification information and compare original part numbers with the listing. Products may fit only particular years, seal designs, or engine configurations, even when both applications are described as 5.7L.
How should you compare these parts?
- For exhaust work, verify the manifold’s stated engine and year range and compare its replacement numbers.
- For cylinder-head service, confirm the gasket set’s contents and exact engine application.
- For fuel delivery, match the existing mechanical pump reference and marine application.
- For an oil pan, confirm capacity, bolt pattern, and rear-main-seal design.
Marine engine parts are application-specific. When an item description is incomplete or fitment is uncertain, compare the original component and consult a qualified marine mechanic or parts supplier before installation.
Frequently Asked Questions
Is any listed product a confirmed marine 5.7 long block?
No. The listings describe replacement components or provide insufficient detail to confirm a complete long-block assembly.
Can a 5.7L MerCruiser part fit every 5.7L marine engine?
No. Fitment can depend on year, engine configuration, marine brand, and component design. Verify the exact application and part number.
Which listed item is for exhaust manifold replacement?
The Weonefit kit is described as a two-piece marine exhaust manifold replacement for specified MerCruiser and GM V8 applications.
What should I confirm before buying the Technical Precision listing?
Ask what the product physically includes and whether it is a complete engine assembly or another replacement item. Its supplied description does not make that clear.
Does the CFR Performance oil pan fit every 5.7L engine?
No. Its listing specifies applications using a one-piece rear main seal and gives particular cross-reference numbers. Verify those details for your engine.