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Water Pump Info circa 2019

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ChillyB View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ChillyB Quote  Post ReplyReply Direct Link To This Post Posted: May/25/2019 at 6:22pm
How old is the photo of that NAPA water pump?  Here's the one I just got a month ago.  Looks very different drom that photo. 

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Greyhounds_AMX View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Greyhounds_AMX Quote  Post ReplyReply Direct Link To This Post Posted: May/25/2019 at 7:36pm
Yours is a later model long pump, and my Napa pump was an early model short pump for 68-72. It had an AMC part number on it so had to be a reman, I bought it around 2001 or so.

We can't see the top of yours from the pic but the later model pump will have the bypass clocked at the 12:00 position as well as the 4-3/4" or so length. 
1968 AMX 390 w/T5
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ChillyB View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ChillyB Quote  Post ReplyReply Direct Link To This Post Posted: May/26/2019 at 6:06am
You're right.  Mine is for a 73.  
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304-dude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: May/26/2019 at 1:05pm
To add to your great thread...

I purchased a standard GMB pump for mockup for working on my mixed year parts engine setup.

GMB 110-1040A

It seems that it shares the same shaft specs as the performance GMB pump.

QUESTION:

IF the diameter is the same from flange to bearing for the oem late pump version... Other than the impeller difference, I assume the GMB shaft design with its corresponding bearing, will be a better option than the factory with smaller diameter shaft at the bearing?

Only if we had a bearing OD to compare with between the GMB pump and late model oem pump, to see if there is a slightly larger bearing bore OD at the GMB snout, for the larger GMB bearing ID... "If" the above question is validated by a confirmation on bearing ID size differneces between OEM and GMB.

71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
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