Guys I have a 2004 Silverado rcsb with Ls6 and mp112.
im wanting to go to a ODcrank pulley, preferably the +15% and there is not enough clearance for it.
I have searched high and low but can not find a water pump pulley smaller than stock size 5.85”

 

I don't think they make one man. And you're gonna have a helluva time pressing it off and on. Major suckage will ensue

if the car ones are smaller you can do a car pump with spacers to get it where it needs to be for alignment

 

If you are gonna go 15% you need to go to an electric water pump. The 10% is the cheaper way to go.

 

Yep, you will need an accessory bracket from pcm of nc to run one as well. That's the main reason I went with 10% instead of 15...

Get ready to pin that crank pulley as well.