The type of vehicle you plan on swapping for an LS matters when determining which water pump to purchase. Water pumps (much like power steering pumps and crank pulleys) follow the same spacing guidelines and vary from one auto to the next. Make sure to check the list below before selecting your water pump to ensure proper fit and placement.
Corvette, CTS-V, SS (sedan), & G8 are represented by a -1 (dash one) spacing
1998-2002 Camaro & GTO are represented by a -2 (dash two) spacing
All trucks & 2010-2015 Camaro are represented by a -3 (dash three) spacing