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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.

LS accessory drive spacing: F-body, Corvette/car, truck
SpacingNameFound onMeasurementsNotes
-1CorvetteCorvette (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).
-2F-Body / GTO1998–2002 Camaro/Firebird (LS1), Pontiac GTO (LS1/LS2)[{"value": "2-15/16 in", "basis": "LSX Concepts chart", "source_id": 3}]
-3Truck / 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

PumpOffsetGenOutletVVT clearanceExample partNotes
LS1 water pump-1Gen IIIcar style0ICT WAT200Most 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-1Gen IVcar style0ICT WAT101
Gen III truck pump-3Gen IIIvertical outlet on top0ICT WAT300
Gen IV truck pump-3Gen IVvertical outlet on top1ICT WAT301One of only two pumps that clear a VVT timing cover (ICT).
LS3/L99 Camaro pump-3Gen IVoutlet upper driver side1ICT WAT302One of only two pumps that clear a VVT timing cover (ICT).

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