6066 (1960-1966) GMC Truck Club Bitcoin now accepted here! 
Pay Dues
Pay Dues or become a Site Supporter
 



Go Back   6066 (1960-1966) GMC Truck Club > 6066 GMC Truck Club Forum > GMC V6 and V12 Engines
#Sponsored

GMC V6 and V12 Engines Engine repair and rebuilding

Reply
 
Thread Tools
  #11  
Old May 7th, 2023, 03:33 PM
Sabesimpson Sabesimpson is offline
Junior Member
 
Join Date: Dec 2022
Location: Camarillo, Ca
Truck: 1965
Age: 48
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 21
Sabesimpson is on a distinguished road
Default Re: Thermostat housing / water outlet

Quote:
Originally Posted by BobBray View Post
I found this one for an older Pontiac, but the outlet is more vertical:

https://www.rockauto.com/en/moreinfo...10337&jsn=1638
Hi! What vehicle did you look up for this?
Thanks.
Reply With Quote
  #12  
Old May 7th, 2023, 03:43 PM
James James is offline
-= Extreme Supporter =-
 
Join Date: Jun 2013
Location: Greer, SC
Truck: 1964 GMC 1500 2wd
Age: 69
Posts: 449
Thanks: 8
Thanked 4 Times in 3 Posts
Rep Power: 206
James will become famous soon enoughJames will become famous soon enoughJames will become famous soon enough
Default Re: Thermostat housing / water outlet

Quote:
Originally Posted by Sabesimpson View Post
Hi! What vehicle did you look up for this?
Thanks.
According to Rock Auto it fit:

PONTIAC ACADIAN 1968-1971
PONTIAC BONNEVILLE 1959-1970
PONTIAC CATALINA 1959-1970
PONTIAC FIREBIRD 1967-1969
PONTIAC GRAND PRIX 1962-1970
PONTIAC GTO 1964-1970
PONTIAC LEMANS 1966-1970
PONTIAC TEMPEST 1961-1970
PONTIAC VENTURA 1960-1961

With a 389 cid or the 400 cid engine.

I don't know if it will fit the GMC V6.
Reply With Quote
  #13  
Old May 8th, 2023, 04:37 AM
BobBray BobBray is offline
-= Dues Paid =-
 
Join Date: Feb 2013
Location: Los Angeles, CA.
Truck: 1967 CM 2500
Posts: 260
Thanks: 3
Thanked 3 Times in 2 Posts
Rep Power: 156
BobBray will become famous soon enoughBobBray will become famous soon enough
Default Re: Thermostat housing / water outlet

It all depends on which water crossover you have. The later Pontiac thermostat housing with the wider bolt spacing fits my '67 351.
Reply With Quote
  #14  
Old May 8th, 2023, 04:52 AM
Sabesimpson Sabesimpson is offline
Junior Member
 
Join Date: Dec 2022
Location: Camarillo, Ca
Truck: 1965
Age: 48
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 21
Sabesimpson is on a distinguished road
Default Re: Thermostat housing / water outlet

Thanks! My cross over has the housing sitting on top at this point if vertical I will try to Mach up a hose. I just need the 3” in center bolt holes
Reply With Quote
  #15  
Old May 8th, 2023, 05:00 AM
Sabesimpson Sabesimpson is offline
Junior Member
 
Join Date: Dec 2022
Location: Camarillo, Ca
Truck: 1965
Age: 48
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 21
Sabesimpson is on a distinguished road
Default Re: Thermostat housing / water outlet

Here is a shot of the cross over
Attached Images
File Type: jpeg IMG_5213.jpeg (114.7 KB, Multiple views, 10 clicks)
Reply With Quote
  #16  
Old May 16th, 2023, 01:35 AM
Sabesimpson Sabesimpson is offline
Junior Member
 
Join Date: Dec 2022
Location: Camarillo, Ca
Truck: 1965
Age: 48
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 21
Sabesimpson is on a distinguished road
Default Re: Thermostat housing / water outlet

Update….. I was able to match up a housing at NPD in Ventura!
Now I found an oil leak coming from up top and running down the top of the bell housing. Smh
Attached Images
File Type: jpeg F019855B-E780-4AFD-AE6B-9F78BFF10C22.jpeg (2.17 MB, Multiple views, 8 clicks)
File Type: jpeg A4461E29-0804-47F8-9F3E-F755E3EFEF39.jpeg (3.02 MB, Multiple views, 7 clicks)
File Type: jpeg 3273338B-F8BC-4898-B2DD-7CC9EF872AE8.jpeg (3.05 MB, Multiple views, 4 clicks)
Reply With Quote
  #17  
Old May 16th, 2023, 08:16 AM
Prowbar Prowbar is offline
Senior Member
 
Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
Posts: 434
Thanks: 8
Thanked 10 Times in 9 Posts
Rep Power: 198
Prowbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the rough
Default Re: Thermostat housing / water outlet

Quote:
Originally Posted by Sabesimpson View Post
Update….. I was able to match up a housing at NPD in Ventura!
Now I found an oil leak coming from up top and running down the top of the bell housing. Smh
Good job on the housing.

Some thoughts regarding oil leaks:
1. Rear freeze plug in the camshaft bore... Inaccessible unless you have the motor out. Had this on my old 305E.
2. Valley cover gasket. Easy to replace.
Reply With Quote
  #18  
Old May 16th, 2023, 09:48 PM
Sabesimpson Sabesimpson is offline
Junior Member
 
Join Date: Dec 2022
Location: Camarillo, Ca
Truck: 1965
Age: 48
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 21
Sabesimpson is on a distinguished road
Default Re: Thermostat housing / water outlet

Thanks! The investigation starts tonight!
Reply With Quote
  #19  
Old May 18th, 2023, 02:33 AM
Sabesimpson Sabesimpson is offline
Junior Member
 
Join Date: Dec 2022
Location: Camarillo, Ca
Truck: 1965
Age: 48
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 21
Sabesimpson is on a distinguished road
Default Re: Thermostat housing / water outlet

Prowbar,
Investigation complete! You were correct rear freeze plug @ camshaft bore. Oddly, it looks like someone replaced it. Guess i will be pulling the motor sooner then i wanted.
Reply With Quote
  #20  
Old May 18th, 2023, 08:24 AM
Prowbar Prowbar is offline
Senior Member
 
Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
Posts: 434
Thanks: 8
Thanked 10 Times in 9 Posts
Rep Power: 198
Prowbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the rough
Default Re: Thermostat housing / water outlet

Quote:
Originally Posted by Sabesimpson View Post
Prowbar,
Investigation complete! You were correct rear freeze plug @ camshaft bore. Oddly, it looks like someone replaced it. Guess i will be pulling the motor sooner then i wanted.
Interesting. One check you can do before pulling the engine is to check if the camshaft drain hole is clear.

In the last cam journal, the closest one to the freeze plug, there is a small hole drilled (about .150") longitudinally in the journal to relieve the oil that gets trapped behind the camshaft galley and freeze plug. These can also get clogged with sludge and junk.

Remove the intake manifold and valley cover, then turn the engine so the drain hole is facing upwards. With a small screwdriver or drill bit, you should be able to poke it through.

Having it clogged or at least, close to clogged, build up excessive pressure causing the freeze plug to leak.

Hope this helps.
Reply With Quote
Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Water Outlet Archiver Previous Forum Posts 1 January 6th, 2012 07:21 AM
water outlet Archiver Previous Forum Posts 0 October 1st, 2004 04:01 AM
Re: [6066 GMC Truck] Water outlet 305E not t stat housing needed here! Archiver Previous Forum Posts 0 January 8th, 2003 08:25 AM
Re: [6066 GMC Truck] Water outlet 305E not t stat housing needed here! Archiver Previous Forum Posts 0 January 8th, 2003 04:06 AM
Re: [6066 GMC Truck] Water outlet 305E not t stat housing needed here! Archiver Previous Forum Posts 0 January 8th, 2003 02:52 AM


All times are GMT +1. The time now is 07:12 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 781729009125|1727806379|0