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Waterpump/Intake/Heater hose questions

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kz1000ltd

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Discussion starter · #1 ·
OK, I searched and searched, and did not come up with any answers, so heres goes. I'm in the process of putting a new heater core and waterpump into my 69' 396 car. First off, the car did not have a heater core to begin with, so both water fitting inlets on the intake were blocked off. On the old GM water pump, there were (2) inlets for the heater hoses, one blocked off, the other one going directly into the front of the intake. Here's my question(s): First of all, I purchased a new chrome waterpump from Summit, but it only has one heater hose fitting on the front of it, not two like the old GM pump did. Why is this? The new heater core has a 5/8 and a 3/4 inch line, which line goes where, and to which fitting in the intake? I'm confused. If I route the one fitting on the new pump to the front of the intake, where would the 2 heater hose lines run into, the two fittings on the intake that are currently bypassed, and if so, which side is which? Is this making sense to anyone? Surely somebody has gone through this before, any help would be greatly appreciated! KZ

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John D. Smith
69 SS/396 CLONE!
The Texas Tornado lives!
http://www.geocities.com/kz1000ltd/
 
#2 ·
Sounds as if your water pump was not designed to supply a heater core. All of my after market pumps have two fittings. The larger hose, I believe, usually hooks to the pump itself (suction side). Lets have a few more people give their advice.
 
Discussion starter · #3 ·
Why would anyone make a waterpump not compatible with a heater core? Someone help me out here, is there any way to hook up a heater core to a waterpump with only (1) threaded inlet? I have 3 places on the intake to run fluid, one big nipple threaded into the the very front, 2 on the top, one on each side of the thermostat housing. Those two are plugged right now. Heater core has a 5/8" tube out and a 3/4" tube out. It can't be this complicated, can it?
Image


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John D. Smith
69 SS/396 CLONE!
The Texas Tornado lives!
http://www.geocities.com/kz1000ltd/
 
#4 ·
They sold you the wrong water pump; the big-block pump for your application has two threaded outlets at the top. One uses a short molded hose to the horizontal fitting at the center front of the intake manifold (the bypass line), and the one closest to the passenger side is for the heater hose. The other heater hose fitting is at the front corner of the intake on the passenger side (the threaded hole at the front on the driver's side is for the temp sender).

The fitting on the intake manifold is the outlet, and that hose goes to the lower fitting on the heater core; the hose from the upper fitting on the heater core goes to the fitting on the water pump, which is the inlet. The intake-to-core hose is 5/8" ID, and the water pump-to-core hose is 3/4" ID.

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JohnZ
'69 Z28 Fathom Green
 
#6 ·
John,

John Z is right on. I went home and looked at my busted up so called BB GM high performance water pump and it has two threaded locations for water connections. One for the bypass and the other one for a heater hose.

Find anything else good at the swap meet today????

[This message has been edited by sr71bb (edited 11-10-2001).]
 
Discussion starter · #7 ·
Greg, yea, JohnZ was right on, I went into the garage and checked the box, sure enough, they had sent the wrong pump!!!!! Good grief........Maybe I'll go back out to the swapmeet tomorrow and get a BB waterpump, Summitt can have theirs back and stick it where the sun don't shine. Takes 8 days to get here, then it's the wrong one! Frustrating, to say the least. I picked up a new chrome one wire alternator, few odds and ends, I was outta there by noon, I never did run into SSDanny and his buddies. Oh well, there's always tomorrow! KZ

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John D. Smith
69 SS/396 CLONE!
The Texas Tornado lives!
http://www.geocities.com/kz1000ltd/
 
#8 ·
The wrong one?? Did they send a long pump when you needed a short one??

Just wondering so the rest of us can avoid this strange problem.

Joe
 
#9 ·
My Car has one hose that goes from the water pump to the heater core, and one hose from the intake to the heater core. I think the smaller of the two fittings goes on the intake. And the bigger fitting goes on the water pump.
 
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#11 ·
DJD:

I don't know where the small referance came from, I thought KZ was talking about a big block and that's what I wondering about.I have never heard of problem like this. I currently own a big and small block cars. I was wondering if it was related to the differance between long and short water pumps and if short pumps have two outlets while longs only have one? It's easy to tell a long pump from a short but this plug thing has me thinking. I live in an area where I must rely on special order for most of my parts. They are pain to return. Little things like this help out allot when inspecting parts before taking them home. When you live 10 miles from the nearest parts store it makes for a long trip that has you steaming mad when parts are wrong.
 
#12 ·
Some small-blocks did use a bypass hose from a fitting on top of the water pump to the front of the intake manifold - but only on '65-'67 Corvette 327/350-365-375's - no Camaros. More trivia
Image
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JohnZ
'69 Z28 Fathom Green
 
Discussion starter · #13 ·
It had nothing to do with the long or short waterpump, it was all about somebody at Summitt having their heads up their a$$.....
They just sent me the small block long pump instead of the big block long pump. They looked an awful lot alike, if it weren't for me asking these questions about the missing fitting on the front, I might have actually tried to put it on! I went with an aluminum Weiand pump instead of the chrome one, haven't gotten it put back together yet, next weekend project.......KZ

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John D. Smith
69 SS/396 CLONE!
The Texas Tornado lives!
http://www.geocities.com/kz1000ltd/
 
#14 ·
I see said the blind man.........Thanks for input KZ. This one had me wondering what was up with water pumps........well not much except as KZ says the typical bend over pull butt cheaks apart and insert head syndrome, see so often at parts stores these days.

Joe
 
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