Looking for a SILVERADO 6.6L LMM ENGINE (for Chevrolet Silverado/GMC HD trucks)? Here’s a detailed, well‑structured overview of options, specs, pros/cons, and buying tips tailored to your needs:
What’s a SILVERADO 6.6L LMM ENGINE?
The SILVERADO 6.6L LMM ENGINE turbo‑diesel used in HD GM trucks from mid‑2007 to 2010.
-
Output: ~365 hp @ 3,200 rpm, ~660 lb‑ft torque @ 1,600 rpm .
-
Construction: Cast iron block, aluminum heads, Bosch high‑pressure injection (CP3.3 pump), Garrett water‑cooled variable‑vane turbocharger. Compression ratio 16.8:1 .
-
Emissions Gear: Features DPF, EGR, DOC, DEF (in some markets)
-
Notable Weakness: Pistons are known to crack under heavy load .
Available for Purchase? Where & Approximate Prices
a. Remanufactured/Crate Long‑Block
-
Choate Performance sells a remanufactured long-block crate engine (2007.5–2010) with new internals, warranties, machining, etc., for $12,700
b. Used Engines (Budsautoparts)
-
Genuine OEM LMM engine: around $5,295, with “Best Offer” .
-
Used assemblies (~198 k miles): approximately $6,079 .
-
Tested engine (~93 k miles): about $4,949, includes 90‑day warranty and free shipping .
-
Units in Canada: ~C$5,562 (≈ US$4,200–4,600).
Reliability & Community Feedback
Many SILVERADO 6.6L LMM ENGINE owners report long engine life with minimal major issues:
Another user notes:
Comparison At-a-Glance
| Option | Price (USD) | Pros | Cons |
|---|---|---|---|
| Remanufactured long‑block | ~$12,700 | New components, warranty | Costly (~2–3× used cost) |
| Used low‑mile tested engine | ~$5,000–6,000 | Budget-friendly, tested | Unknown wear, limited warranty |
| Used high‑mile assembly | ~$4,000–5,000 | Cheapest upfront | Higher risk of wear, rebuild may follow |
Buying Tips
-
Prioritize engine condition over price—a tested, lower‑mile unit often offers better value than a cheaper high‑mile one.
-
Request warranty terms whenever possible. Listings offering 90‑day coverage add peace of mind.
-
Factor in shipping, import duties, and whether you’ll need core return charges.
-
Check VIN code (8th digit = “6”) to ensure LMM compatibility if picking from another vehicle
-
Consider piston cracking risk if towing or hauling heavily; plan preventative maintenance.
Summary
If budget permits and you want reliability with coverage, the $12,700 crate engine offers peace of mind with new internals.
On a tighter budget, a used tested unit (~$5K) is a solid compromise.
Despite being over a decade old, many of these engines have run past 400k – 500k miles reliably
