I'm running a built 4th gen iron block w/ LSA heads and my original '09+ LS3 water pump in my vette and am looking for wider water pump pulley options to accomodate my blower belt.

Here's a comparison of the LS1 pump/pulley vs. LS3 pump/pulley. I don't think the LS1 is a direct swap, but I've heard the LS6 might work? Any thoughts on how to get a wider pulley?




Here's an LS6 pump on an LS7

 

I've got the pump on the bottom, if you have the top one, I'd be happy to trade.

 

LS3 will work with Corvette accessories
LS3 will work with F-body accessories with 3/4" water pump spacers

 

LS3 will also work on F-Body if you pull the pulley off the pump shaft by approx 8mm.

Leaves you a lot more clearance up front.