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03-26-2019, 06:18 PM
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#1 |
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Senior Member
 
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,322
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Water pump studs
Found on the parts book a stud was used to mount the water pump, generally placed on the top passenger side on most trucks. The 70-71 BBC takes two different studs, one is placed on the top driver's side as well.
What were these studs for? I found mine with 3/8-16 x 1.3/4" bolts. They're stamped with a dog bone, which is era correct, but don't know why I'd have four if it had studs. 1.3/4" seems a little short as well, with a lock washer they're not even using 1/2" of a 1" hole. Not even that with the top alternator bracket mounted by the top driver's side bolt/stud. http://www.gmpartswiki.com/getpage?pageid=21310
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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03-26-2019, 06:34 PM
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#2 |
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Senior Member
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,975
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Re: Water pump studs
Tony, I believe they mounted the AIR pump brackets (at first glance I thought one was for the funky bbc alternator bracket, but it mounts elsewhere).
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03-26-2019, 07:41 PM
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#3 |
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,322
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Re: Water pump studs
No sign of AIR pumps on a 70-71 BBC (Edit: Not quite right. Looks like some variables, Ca. and that) . If the LH top took a stud, which the book says it does, then it did mount the alternator bracket.
You can find the right stud for the RH side (BBC), it's 3759755. Word is the 3/8" thread is 1.75" long.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 03-28-2019 at 12:38 AM. |
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03-26-2019, 07:50 PM
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#4 |
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Registered User
Join Date: Dec 2013
Location: Omaha NE
Posts: 620
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Re: Water pump studs
I don't have my big block at home, but my current project(350) uses one of the studs for the temp sensor wire.
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1972 C10 Custom Deluxe LWB, 402/400, PS, PB, A/C, Highlander, Hugger / White 1971 C10 Cheyenne LWB (SWB), 350/350, PS, PB, A/C, Dark Olive / White. |
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03-26-2019, 09:17 PM
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#5 | |
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,322
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Re: Water pump studs
Quote:
That's the same stud used on the top RH side of a BBC.................................Edit: More specific, a 70-71 BBC takes the 3759755 on the top RH side. And a 71-72 BBC takes the MIA 3927111 on the top LH side. Reads it's a 3" stud end to end. 71 was sure on the cusp of things. Part 70, part 72. If it's my Chevy then it's part 70, part 72 and part GMC considering the leaf springs  I mean 
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 03-26-2019 at 10:11 PM. |
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03-27-2019, 09:37 PM
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#6 |
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,322
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Re: Water pump studs
BBC water pump studs anyone? Curious what the LH stud looks like, and what each one was used for.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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03-27-2019, 10:39 PM
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#7 | |
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,322
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Re: Water pump studs
Quote:
I think it's the stud I'm looking for (3927111), though the short end seems long. Then again I don't know what its used for yet  . Definately not the temp sensor like Lan's 72, because they're on the RH head for a BBC. That's my understanding anyway.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 03-27-2019 at 10:49 PM. |
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03-27-2019, 10:58 PM
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#8 |
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Junior Member
Join Date: Oct 2017
Location: Oregon, Ill.
Posts: 62
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Re: Water pump studs
Tony, the LH, Passenger side stud is fine threads, I think it must be for the A/C compressor, but not sure. The RH Drivers side stud is for the lower bolt on the Alternator bracket and is course thread. Thats the way my 396 is set up.
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Greg 69 Longhorn 396, 4 Speed SM 465, PS, PB, No Air |
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03-27-2019, 11:01 PM
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#9 |
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Junior Member
Join Date: Oct 2017
Location: Oregon, Ill.
Posts: 62
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Re: Water pump studs
trying to attach pic.
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Greg 69 Longhorn 396, 4 Speed SM 465, PS, PB, No Air |
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03-28-2019, 12:29 AM
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#10 | ||
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,322
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Re: Water pump studs
Quote:
Quote:
OT.........I found my water pump and thermostat with lock washers. Correct me if I'm wrong, but I don't think they're suppose to use lock washers. Was shopping for "correct" (marked "TR") and replacement bolts for the thermostat housing. All of the "correct" bolts measure 1" and 1.7/8". Strikes me odd considering even without a lock washer and gasket, the long bolt grabs nothing but 1/4", while the 1" takes 5/8"............Came up empty for a 2" "TR" bolt. ARP black oxide will work, they come 1" and 2". On a side I think some applications took a stud(s) instead. Read a post by an antique owner who swears by studs. Seal and install for permanent to avoid stripped cast iron threads
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 03-28-2019 at 06:02 PM. |
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