For those of you running an adapted stock serpentine setup from a 3rd generation f-body, caprice, etc., what water pump are you using?
I know it needs to be a long, reverse rotation variety. But the ones I'm finding don't have an outlet for the heater hose on the passenger side. They do have a plugged port on the top of the pump. Is that where the heater hose connection is made?

Thanks in advance if you can point me in the right direction.

 

While I still haven't completed this project. I would say yes. It's npt fitting can't remember if it's 1/2 or bigger.

 

Just a double check, I am putting an L98 into my C3 and it calls for a short water pump. Not sure what you a putting in,and you are probably correct, just make sure it's right before you do all that work.

 

I think you can run heater hose from intake port on top through heater back to fitting on water pump

 

I think it depends on which serpentine you use. Mines uses the 6 15/16 long pump.. if that causes fan issues I've got a back up plan for that, but yes definitely want to make sure you are using the right accessories for whatever conversion you are using. Either way the majority should have an npt fitting for heater hose on them.

 

I am running a serpentine setup from a 92 Camaro. I used the same water pump the 92 Z28 uses. The port on top is the one you want - I used it for my heater hose, works fine.

You may also find the lower radiator hose is tight and sits on the frame crossmember.

 

Excellent. Eactly what I needed to know. Would you be willing to share a pic of yours that shows how you routed the hose and fittings you used? I pulled an entire setup (minus the water pump) off an 89 firebird at my local pick a part this weekend. They also had a 90 caprice with the same system, but it looked like the p/s pump sat a little lower in that one.

 

I used the set from a 87 camaro since it used the same style ac compressor hoping the factory lines from the vette would fit. I ditched the heater hoses as my car was missing the block off valve and I dont need it hot in th esummer.

 

Sure, here are a couple views below - the close-up may not be as helpful as you wanted. My engine bay is not much to show off - please keep in mind I'm more interested in functionality than showmanship....

When removing the valve cover I have to pull the hoses to one side - it is tight, but there is enough room.

Also, check the clearance behind the alternator and your driver side valve cover. I recall having to grind and repolish a small area at the front end of my driver side aluminum cover to avoid the output post.

I like this as a mod, just lots of little details that you find as you get into it.

A few other things I learned:top view showing hose routing




best close view I couple get of the fitting. I beleive it's a 1/2" NPT - I picked it up at autozone while gathering parts for this.

 

Thanks a bunch for the pics!

 

And the spring tensioner is the icing on the cake

 

Here's a shot of a non AC setup I did. You should use the 3rd gen fbody upper hose and t-stat. The LH bracket on yours should have a hose rest bracket for it.

 

Yeah yeah yeah I'm replying to this year-old thread, but its to say thank you. I'm in the process of doing this conversion and was a bit stuck at the water pump, upper hose, and AC (address the AC later.) I'm using the serpentine brackets from an early 90's Caprice.
You answered the questions about hose and pump for the heater hoses.

For the upper hose, I went to three auto stores in my town and couldnt find one to fit. I tried that angle water neck/thermostat housing but couldnt use because it interfered with temp gauge sending unit in manifold. So i went with water neck that points straight. The only hose from auto parts store that fit was the universal flex one (24 inch). It was tight, and too close to the alternator fan. When i revved the engine, the hose flexed and hit the fan and burst. What a mess. I ordered a stainless upper hose (36 inch) and will cut it and route it for clearance.

I used power steering pump from the Caprice. It worked out perfectly with the Borgeson steering box; the low pressure return line already pointed in the direction for the hose hookups.

The alt was rebuilt and clocked to fit next to valve cover. I used a one wire alt, so it worked out. The other wires i folded back into the harness. I swapped stock gauge with volt meter so the one wire setup works well. I didnt route the house behind the alternator because even though the built in bracket for the hose was there, it was built for a low, stock valve cover. So front facing hose routing with 90 degree turn is how the upper hose will be routed.

The water pump was a challenge. In fact, i got a new one for the caprice , but it didnt have the plugged hole, so i'll have to remove it and replace it with one that does. More parts for trading. :-) If anyone has recommendations for pump that'll work with the serp brackets AND has the upper npt hole for heater hose, I'd be grateful.

Thank you for posting the pictures! Your fuel log setup looks great, i have the parts to do the same thing, but will be adding a return-style regulator right next to carb. (For the rear mounted electric pump)

 

I've updated my inventory with other little doo dads I've come up with-for example, here's my dual temp BMW fan switch and threaded adapter for use in the radiator hose....

 

Here's a pic of it...

 

It's simple to wire in....center is chassis ground, one wire is low temp trigger the other is high temp trigger.

 

Whoaaa, nice! What are the triggers? I have 185 on/170 off in one head, and 195 on/185 off in the other head; Wiring that switch into the upper rad hose could be an elegant solution. (Might need to do this on a separate thread...off topic.)

 

There are 2 switches available...195/180 is one switch and 220/205 is the other

 

The triggers would be fan relays to control either a dual speed fan or a pair of fans wired in series for low/high speed operation.

 

got a part number for the dual fan switch?