2002 pontiac firebird engine 5 7 l v8 for sale
2002 Pontiac Firebird 5.7L V8 Engine for Sale: The Definitive Buyer's Playbook
The 2002 Pontiac Firebird marked the final year of the iconic fifth-generation Firebird, and its 5.7L V8 (LS1) remains one of the most sought-after swap and replacement engines in the American muscle car scene. Whether you are rebuilding your Trans Am or restoring a base model, finding a reliable 5.7L LS1 engine for sale requires knowledge, patience, and a sharp eye. This playbook gives you everything you need to make a confident purchase.
Key Takeaways
- Engine identification: The 2002 Firebird 5.7L is the LS1 V8 producing 320 hp and 340 lb-ft of torque, with VIN checksum digit 9.
- Affordable replacements exist: Used LS1 engines from wrecked Vettes, Camaros, and Firebirds typically run $1,800–$3,500; remanufactured units range $4,500–$7,500.
- LS1 swap compatibility: The LS1 shares the LT1 bolt pattern and many ancillaries, making it interchangeable within GM's Gen III platform.
- Inspect before you buy: Compression testing, oil pressure verification, and coolant system checks are non-negotiable before purchasing any used engine.
- Watch for head gasket leaks: The LS1 is notorious for rear main seal and occasionally head gasket issues—always verify these on a cold engine.
Understanding the 2002 Pontiac Firebird 5.7L V8 (LS1)
Factory Specifications
| Specification | Details |
|---|---|
| Engine Code | LS1 (VIN checksum = 9) |
| Displacement | 5,663 cc (345.5 cu in / 5.7 L) |
| Bore × Stroke | 4.00 in × 3.62 in (101.6 mm × 91.9 mm) |
| Compression Ratio | 10.2:1 |
| Horsepower | 320 hp @ 5,200 rpm |
| Torque | 340 lb-ft @ 4,000 rpm |
| Valvetrain | OHV (pushrod), 16-valve, aluminum heads |
| Block Material | Cast iron |
| Intake | Liquid-spouted aluminum manifold with sequential fuel injection |
| OEM Part Number | 12560577 / 12559675 |
| Estimated Factory Life | 150,000–200,000 mi with proper maintenance |
The LS1 is widely regarded as one of GM's best production V8s. Unlike its predecessors, it features an independently controlled dual exhaust system, revised combustion chambers, and a more robust crankcase design that eliminated many of the weaknesses found in earlier LT1 engines. For 2002, General Motors also refined the camshaft profile and improved the intake runner design compared to earlier LS1 applications, yielding slightly better low-end torque.
Where to Buy a 2002 Firebird 5.7L LS1 Engine
Primary Sources at a Glance
| Source | Price Range | Reliability | Warranty | Best For |
|---|---|---|---|---|
| AutoSalvage.com / Junkyards | $1,500 – $2,800 | Moderate | 30 days – 3 months | Budget rebuilds |
| eBay Motors | $1,800 – $4,000 | Variable | Seller dependent | Comparison shopping |
| GM Remanufactured (Core Exchange) | $4,500 – $6,500 | High | 3 years / 36,000 mi | Long-term reliability |
| Lingenfelter / Performance Shops | $5,500 – $8,000+ | Very High | 12 months unlimited | Restorations & performance builds |
| Local Pull-Yards (U-Pull) | $800 – $2,000 | Unknown | None | Experienced DIYers |
| Facebook Marketplace / Craigslist | $1,200 – $3,000 | Highly Variable | None | Deal hunters |
| Pontiac/Firebird Specialty Clubs | $2,000 – $4,500 | Known History | Varies | Vault-quality units |
Vetted Vendor Recommendations
- RockAuto.com — Curated used and remanufactured LS1 options with buyer protection.
- GetFaster.com — Known for quality used GM crate engines with testing documentation.
- Lingenfelter Performance Engineering — Top-tier remanufactured LS1/LS6 engines with full warranty support.
- Fairlane Rebuilders — Restorations specialist with documented LS1 inventory.
- NOS Engines (nationalengine)** — Network of vetted rebuild shops across the U.S.
Pre-Purchase Inspection Checklist for a Used LS1 Engine
Before wiring a single dollar to a seller, walk through this actionable checklist. Skipping any step can cost you thousands in unexpected repairs.