C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Edelbrock Waterpump Install Problems

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Old Sep 17, 2004 | 10:54 PM
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Default Edelbrock Waterpump Install Problems

I was swapping engines earlier. Took out the engine and waterpump with it and sold it. Now I have the new long block and trying to make the Edelbrock water pumo work. Seems to me that on the right side are 2 studs. Also there is the AC bracket which hooks into those 2 studs. However, the bracket part that the studs go thru seems about 1/4 in higher than the nut. Is there some special stud or what am I missing. TIA
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Old Sep 18, 2004 | 01:13 PM
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What year vette, and what part number Edelbrock Water Pump?

Can you post a photo of it?
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Old Sep 18, 2004 | 01:28 PM
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It is the 8815 one and it was for my 91. I don't have pics yet but I will try get them. Basically the AC bracket hooks up to the head and the water pump studs. However when the bracket lines up with the heads and the water pump, you can see that there is a gap between the nut on the stud (the nut is part of the stud) and the bracket where the water pump studs are concerned.
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Old Sep 20, 2004 | 02:49 PM
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ttt
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Old Sep 20, 2004 | 03:37 PM
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Doesn't sound good. Might want to measure the thickness of the waterpump where the studes go through. I can measure mine tonight for you. My '90 should be the same. I just installed all that yesterday on mine... GM pump though.
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Old Sep 20, 2004 | 03:40 PM
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Originally Posted by Trog
Doesn't sound good. Might want to measure the thickness of the waterpump where the studes go through. I can measure mine tonight for you. My '90 should be the same. I just installed all that yesterday on mine... GM pump though.
That would be sweet. Thanx
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Old Sep 20, 2004 | 08:17 PM
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I used the Edelbrock Water Pump on my 91' without any problems.
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Old Sep 20, 2004 | 10:47 PM
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Originally Posted by chriswtx
I used the Edelbrock Water Pump on my 91' without any problems.
Maybe I should have saved the studs from the original. Anyone know what they look like?
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Old Sep 20, 2004 | 11:57 PM
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I would call Edelbrock's tech support.
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Old Sep 21, 2004 | 12:40 AM
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My problem is that I don't think I have the right water pump studs. They are NA from GM and I don't know where to find the right ones. Anyone?
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Old Sep 21, 2004 | 01:19 AM
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top pump hole area is approx 1 & 1/8" thick

Can't really get to the bottom one.

Top Stud -

The nut area in the middle that you first tighten the pump down w/ is a little under 3/8" thick. Thats what makes up the space between the pump the air cond. bracket. Same for the bottom stud but it is of course longer where it goes through the pump & then shorter after its mid-mounted nut area. Overall the bottom stud on mine when installed is about 1/4" shorter than the top. The top stud also has a steel support bar that attaches between it & the bottom front air cond. pump mounting bolt. That bar installs before the last nut on the stud.

Hope that all made some sense.
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Old Sep 30, 2004 | 10:55 AM
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Found one of the studs and managed to buy the second one (lower) from GM. That has solved all problems to date. Thanx everyone.
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