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LS accessory drive spacing explained
GM used three accessory drive spacings. Your water pump, balancer and brackets must all match. Measure or check the spacing picker.
| Spacing | Name | Found on | Measurements | Notes |
|---|---|---|---|---|
| -1 | Corvette | Corvette (C5/C6), Cadillac CTS-V, Pontiac G8, Chevrolet SS sedan; ZL1 uses Corvette spacing (LSX Concepts) | [{"value": "2-1/8 in", "basis": "LSX Concepts chart; reference point per their diagram", "source_id": 3}] | LSA (CTS-V/ZL1) crank pulley adds an 8-rib supercharger drive ahead of the 6-rib accessory drive (LSX Concepts). |
| -2 | F-Body / GTO | 1998–2002 Camaro/Firebird (LS1), Pontiac GTO (LS1/LS2) | [{"value": "2-15/16 in", "basis": "LSX Concepts chart", "source_id": 3}] | |
| -3 | Truck / Camaro 2010+ | Gen III & Gen IV trucks and SUVs (Silverado, Sierra, etc.), 2010–2015 Camaro LS3/L99 | [{"value": "3-11/16 in", "basis": "LSX Concepts chart", "source_id": 3}] | Truck belt plane is one rib off the factory 8-rib LSA supercharger drive (LSX Concepts). |
Water pumps
| Pump | Offset | Gen | Outlet | VVT clearance | Example part | Notes |
|---|---|---|---|---|---|---|
| LS1 water pump | -1 | Gen III | car style | 0 | ICT WAT200 | Most flexible: direct fit for -1 and -2 per ICT; with ICT spacers for -3. Does not clear VVT timing cover. |
| LS3/LSA/LS7 Corvette pump | -1 | Gen IV | car style | 0 | ICT WAT101 | |
| Gen III truck pump | -3 | Gen III | vertical outlet on top | 0 | ICT WAT300 | |
| Gen IV truck pump | -3 | Gen IV | vertical outlet on top | 1 | ICT WAT301 | One of only two pumps that clear a VVT timing cover (ICT). |
| LS3/L99 Camaro pump | -3 | Gen IV | outlet upper driver side | 1 | ICT WAT302 | One of only two pumps that clear a VVT timing cover (ICT). |
Related questions
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Sources
- LS Cooling & Water Pump swap guide — ICT Billet
- What Belt Offset Do I Need? — LSX Concepts