: Disassembled and rebuilt to original factory standards using new wearable parts. These offer high reliability and are often backed by a 3-year/100,000-mile warranty.
: A "long block" includes the cylinder heads and valve train, making it a nearly complete drop-in replacement. A "short block" is just the lower portion (block, crank, and pistons) and requires you to transfer parts from your old engine.
: Sourced from salvage yards; the riskiest and cheapest route ($1,000+). These are best for short-term solutions where the vehicle's remaining value is low. 2. Verify Compatibility
: If you are upgrading to a different engine type, check local emissions regulations and DMV requirements, as some swaps may require special certification. 3. Top Retailers and Sources
