SPOOLOGIC 7+7 Billet Compressor Wheel

The SPOOLOGIC 7+7 billet aluminum compressor wheel SL-220-066 fits the GT3788VA turbocharger in 2007.5-2010 Chevrolet Silverado and GMC Sierra 2500 3500 6.6L Duramax LMM; 2011-2016 Chevrolet Silverado and GMC Sierra 2500 3500 6.6L Duramax LML. Its billet design supports increased airflow and sharper throttle response for a performance rebuild.

Features

• 7+7 compressor wheel
• 5-axis CNC-machined billet aluminum
• Extended-tip blade design
• Individually balanced compressor wheel
• Fits the original compressor housing

What's Included

• 1 SPOOLOGIC SL-220-066 billet-aluminum compressor wheel

Fitment

• 2007.5-2010 Chevrolet Silverado GMC Sierra 2500 3500 6.6L Duramax LMM
• 2011-2016 Chevrolet Silverado GMC Sierra 2500 3500 6.6L Duramax LML

Compressor Wheel

• Blade design: 7+7
• Compressor inducer: 61 mm
• Compressor exducer: 88.4 mm
• Extended tip: 97.8 mm
• Material: Billet aluminum

Turbo Compatibility

GT3788VA. Use with the turbocharger and compressor housing specified for this wheel. Verify wheel-to-housing clearance before assembly.

Performance Design

• Designed to support increased airflow over the original cast wheel
• Performance wheel design for improved throttle response and stronger pull under load
• Extended-tip geometry for added compressor airflow capacity

Assembly and Balancing

The compressor wheel is individually balanced. Balancing the completed rotating assembly is recommended best practice. Inspect the shaft and mating surfaces, verify wheel clearances, and follow the applicable shaft-nut tightening specification.

OEM Cross-References

• GM OEM: 12639460, 12642129, 12642314
• Garrett: 790032-0004, 848212-5002S

⚠️ Emissions Notice

Not CARB approved. Not legal for sale or use in the state of California.

⚠️ DIY Product — All Sales Final, No Warranty, No Returns

Every SPOOLOGIC 7+7 Billet Compressor Wheel is intended for experienced turbo builders and qualified technicians. The wheel is individually balanced; balancing the assembled rotating group is best practice. Verify shaft and housing compatibility before assembly. All sales are final - no warranty, returns, or exchanges. See the SPOOLOGIC Warranty Policy for details on parts sold without a warranty.