Brand: GoatEngines·SKU: GOAT-ENG-10270

THE GOAT GM 6.0L 366 Reman Long Block Engine for 1991-1995 Mark V (10 bolt front cover bosses)

6.0L long block engine for 1991-1995 Mark V (10 bolt front cover bosses); stock-style fitment verification recommended.

$2,300.00
or 4 interest-free payments of $575.00 with Shop Pay
Refundable Core Deposit of $350.00 added at checkout.
Availability
Checking stock...
Estimated delivery: calculating...
ShippingFlat Rate
Easy Returns30-day window
WarrantyManufacturer-Backed L...
Secure Checkout256-bit SSL
We accept AMEX Apple Pay SHOP PAY
GOAT Crate Engine

Built for the right kind of project

Built for customers who want a clean, confident engine purchase with the key details visible before checkout.

Confirm fitMatch the vehicle and drivetrain first.
Plan startupOil, timing, fuel, and cooling matter.
Inspect deliveryCheck freight before signing.
Best fit

Street and project builds

Street-driven builds
Classic cars and trucks
Weekend cruisers
Clean replacement projects
Before checkout

Quick checks that protect the build

Vehicle match Confirm year, body, mounts, oil pan, accessories, and engine bay needs.
Drivetrain match Confirm transmission, converter or clutch setup, gearing, and intended use.
Support systems Plan fuel, ignition, cooling, exhaust, oil, and first-start procedure.
Delivery prep Inspect the crate, packaging, and visible engine parts before signing.
Not 100% sure? Keep this page open and contact GOAT with your vehicle, transmission, current setup, and driving goal before placing the order.
Sanity check

Make sure this is the right direction

Balanced choice Good when drivability, reliability, and street manners matter most.
Torque choice Better when the build needs stronger low-end and midrange pull.
Cubic-inch choice Best when the vehicle and drivetrain are prepared for more displacement.
Replacement choice Best when matching the original application is more important than changing the combination.

Key features

  • 6.0L GM stock-style replacement • Long Block Engine • GOAT part GOAT-ENG-10270 • GOAT fitment support before ordering • $350 refundable core charge separate

What’s included

THE GOAT GOAT-ENG-10270 long block engine • 6.0 Liter-366 Cid Applications | Long Block | Medium Duty Truck | Gasket Kit/Oil Pump • warranty / installation documentation • Core-return instructions when applicable

Warranty

Manufacturer-Backed Limited Warranty Coverage

Frequently asked questions

Which vehicles or applications does this engine fit?

91-95 Mark V (10 bolt front cover bosses)

What GOAT part number should I match?

Match GOAT part number GOAT-ENG-10270. Additional VIN, engine-code, and application details are listed in the description.

Is this a long block, complete engine, or engine assembly?

This catalog listing is classified as a long block engine. Included components vary by part number, so use the configuration details in the description as the source of truth.

Is a core charge required?

Yes. The catalog lists a $350 core charge separate from the engine selling price. The core refund depends on the returned core being accepted.

Is this engine new or remanufactured?

This listing is treated as a remanufactured/rebuilt replacement engine based on the supplied engine catalog.

How should I verify fitment before ordering?

Verify the year range, vehicle model, VIN/engine code, emissions package, and any application-specific notes shown on the listing. GOAT fitment support should confirm the match before shipment.

What warranty applies?

Manufacturer-backed limited warranty coverage applies; exact term, mileage, labor, exclusions, and claim requirements should be confirmed for the specific engine at the time of order.

Customer Reviews

Trusted by builders, drivers, and shops nationwide

5.0 out of 51K+ company reviews

“Customer support helped me confirm fitment before I ordered. The engine showed up packed well and exactly as described.”

Mike R.Verified Customer

“The ordering process was simple, the communication was clear, and the build quality gave me a lot more confidence than a local unknown rebuild.”

Jason T.Verified Customer

“Everything looked clean right out of the crate. The team answered my questions and made sure I had what I needed before install.”

Chris M.Verified Customer

“I wanted something built right without guessing on parts. GOAT made the process easy and the engine has been strong from day one.”

Robert L.Verified Customer

“Great packaging, clean presentation, and the engine matched what was listed. That matters when you are planning a full project build.”

Daniel S.Verified Customer

“The biggest thing for me was peace of mind. I could tell this was not just a generic crate engine listing with no support behind it.”

Anthony P.Verified Customer

“Fitment questions were answered before checkout, and that saved me from ordering the wrong setup. Solid experience all around.”

Kevin B.Verified Customer

“I compared a few options before ordering. The warranty, support, and clear product details are what made me choose GOAT.”

Matt H.Verified Customer