Replacement engines are sold in three main configurations: complete engine, long block and short block. Choosing the right one affects your total cost, how much labour is involved, and which parts you’ll need to supply yourself. Here’s how they compare.
Which Engine Configuration Should You Buy?
Choose a complete engine for the simplest installation, a long block to save money when your accessories are reusable, and a short block when you or your builder want to fit your own cylinder head and top-end parts.
Short Block
What’s Included
Engine block, crankshaft, connecting rods and pistons. No cylinder head or accessories.
Who It’s For
Engine builders and situations where your existing head and top-end are in good shape.
Long Block
What’s Included
Everything in a short block plus the cylinder head(s) and valvetrain. No external accessories.
Who It’s For
Buyers with reusable accessories who want to save versus a complete engine.
Complete Engine
What’s Included
A long block with most accessories fitted โ intake, sensors, and often more. Closest to drop-in.
Who It’s For
Buyers who want the least install labour and fewest parts to source.
Cost and Labour Comparison
- Short block: lowest part cost, highest labour and extra parts.
- Long block: mid cost, moderate labour to transfer accessories.
- Complete engine: highest part cost, lowest labour.
Frequently Asked Questions
Which is cheapest overall?
It depends on the condition of your existing parts and local labour rates. A long block often balances cost and convenience.
Can I reuse my old accessories?
Often yes, if they’re in good condition. Confirm compatibility with the new unit.
How do I confirm fitment?
Match the engine code and provide your VIN.
Conclusion
The best configuration comes down to your budget, your builder’s preference, and the condition of your current accessories. Understanding what each includes prevents costly surprises during installation.
Want help choosing the right configuration? Request a quote with your vehicle details. Learn more on our Engine Sourcing page.