Has anyone put a manual fan pulley on a crate LS3?

If so were you able to do this as a complete part number, the pump came with a pulley having the large diameter threads for the mechanical fan or did you swap on a new pulley on LS3 water pump?

If you have a magic part number of the pump that would be great.

To answer the coming question, I simply prefer a manual fan over electric.

 

You can use a truck pump. They fit LS3 accessories and use a mechanical fan.

 

Joe, I have a truck pump and the upper radiator hose outlet hits the throttle body

 

Find out what the guys are doing that are swapping car intakes into their trucks.
Same thing, you have to make the car intake/TB fit and the fans still work. Some of them mentioned swapping the truck pulley onto a car intake.

Why keep the mechanical fan, though? They're such a downgrade. They eat power/torque and decrease MPG, not to mention they don't cool nearly as well in traffic.

 

Joe I am looking for someone that has actually done this. This is not my first rodeo and I have looked at the obvious solutions. The truck water pump has a larger diameter shaft than the LS3 water pump. It would also put the pulley out of line with the rest of the system.

As I stated before, I simply prefer the mechanical fan over electric for my uses. I am putting a 430 HP motor in an old Land Cruiser, power loss from a mechanical fan means nothing. They cool just fine in traffic. Do a little reading about electric fans and overheating due to not enough power for the fans at idle due to not enough alternator.

 

Honestly have never had this problem before.

A few magazines have done what you're looking for. Go hit up google for LS3 Mechanical Fan.

 

https://www.google.com/?gws_rd=ssl#q...Mechanical+Fan

KW

 

I believe the 07-13 truck water pump will clear the car intake and still retain the threads for the clutch fan.

 

Thank you Muh Thugga I am going to check one out today

I did find this, but holy sh** are they proud of it

https://redirect.viglink.com/?format...20V8%20engines

 

Yeah, that's insane.

I'd pick up an 07-13 water pump and a fan out of a Trailblazer/Envoy/SSR.



Here is that water pump with a car intake:


The idler pulley will also need to be relocated. Dirty Dingo sells a kit to do so.

 

That pump puts the pulley 1.5" farther toward the front of the truck and out of line with the rest of the drive accessories. I looked at that pump and a bunch of others at the auto store yesterday. I believe I am going to just go with the electric fans and call it a day.

It comes down to too many changes away from OEM set up to go to the mechanical fan. More changes means more hassle for the owner down the line for maintenance.

 

Unless the engine has Corvette accessories, that truck water pump will work. The accessory spacing did not change between 99-06 and 07-13 trucks.

 

Yes, exactly, LS1 front drive set up. LS3 front drive set has been on back order over 6 months and they pushed the date back to March from Jan on availability.

I've played with a fair amount of Vortec and LS motors, putting them into Land Cruisers. This is the first time I've gone this specific route. The big issue with most solutions to this particular situation is that the fix leaves you with more problems to solve.

I build for reliability, ease of overall maintenance. My customers are not gear heads, they will be taking this truck to the mechanic they trust.

 

OK, so I'm assuming your crate LS3 is corvette spacing, not 2010+ Camaro spacing.
I've used truck pulleys on 98-02 Camaro pumps, but that pulley wont push on far enough for corvette spacing (pic below with truck pulley, Camaro pump, truck spacing).
I wasn't aware of different diameter water pump shafts, but have you checked out a C5 LS1 pump and truck pulley?

 

The end result in any scenario is a miss match of pump and pulley. In the case of a water pump replacement the owner will either be pulling the pulley off the old pump and new pump and pressing the old pulley on the new pump.

I'd do this on my own vehicle, but not on a customer's truck. My customer chose to go with the electric fan set up, so all is mute at this point.

 

Just an FYI, I thought about the same thing....so I made 2 of them. Always got a spare. And mine needed the heater ports relocated, so it was going to be "custom" anyway.

 

Possibly for future reference, the early C5s had water pumps with bolt-on pulleys. Could probably find a pulley that works, or even if the pulley is a one-off, the customer would be able to bolt that pulley onto the replacement pump.