Rbass - you have any build pics? I'll need to compile them and can share them soon. It's been a process
I've got a 2022 Silverado ZR2 that I'm starting to collect parts for.
I've got the older L87 water pump, the ICT tensioner kit - and starting to swap pulleys around. I'm using the water pump in your attached pic, that's the OEM pump on my L84, NOTE: with factory tensioner add-on kit (since our trucks come with stretch fit belts), ICT Billet alternator bracket, and Dayco 89098 upper idler - my belt I went with was a Gates 935K6, don't remember the pn right off. I installed an upper water neck from a 99-06 Truck pump, routes the upper rad hose well below the S/C snout and LT4 throttle body now. This has been one of my biggest issues on this swap. Besides needing to cut out the wiper cowl bc I went with double head to blower spacers for that water neck clearance. Plus raising the blower higher seems the extra air space between it and the valley cover helps dissipate heat well.
I was looking into the LT4 High flow fuel pump - then found your thread using your stock injectors and high pressure fuel pump. Any issues there? AFAIK, I'm not running out of fuel at the moment. As long as you're not running higher than 6-7psi (2.8" ADM pulley) boost you shouldn't run out of fuel and be in the 550-600hp range. With that pulley, factory cats - my map sensor was reading ~25kPa and truck was kinda boggy, so I backed the bypass set screw in toward the bypass valve until it read right at ~150kPa and seems much happier.
Did you use the SCIAP breakout harness that is available? I actually made a breakout jumper (not paying $300 for something I can crimp together myself, will have to find the parts list - those came from Racetronix if I recall, was a few months back - maybe ran around $30-50 for all the parts/shipping/whatnot. Issue on our L84/L87 platforms is AFAIK, we don't have an IAT wire we can disconnect from the MAF and jumper it to the MAP pin 2 position. Someone correct me if I'm wrong, but I think it's part of the MAF or our ECM uses the ambient temp reading.
I've got the alternator bracket/idler pulley on order from Magnuson (ADM sent me their way).
What did you end up using for a Heat exchanger? Factory LT4, bought from some Chevy dealership online was around $300. I removed the Active air grille, disabled the DTC for it, and installed the ADM mount kit for the 14-18 Trucks with some slight modifications and standoffs for the heat exchanger to mount correctly x/y/z in relation to the position of the front of the truck. Coolant reservoir, I bought a universal black one on Amazon and it's installed in the fender opening on passenger side slightly forward/to right of the battery/fuse box and few inches from headlight bulkhead. I also used the AAG (air grille) 12v switched wire (color is purple and something, not at the truck at the moment) to control the pump relay.
I've been procrastinating to write up the full build/aggregate pics due to laziness and holidays/work. I will post them here and likely create a new forum thread for the overall project in the upcoming weeks. Please reach out if you have any questions, I likely can point you in the right direction or we can figure it out together.
Thanks!