Re: Newbie thinking about diving into a '65 GMC 1000
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Last night I also put in some new spark plugs set to the correct gap of 0.035". |
Re: Newbie thinking about diving into a '65 GMC 1000
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Re: Newbie thinking about diving into a '65 GMC 1000
Used Prestone radiator clean/flush, and then also reverse flushed w a hose. There was no thermostat so I put in one of those too. Now she seems to stay around 210. On to the next thing.
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Re: Newbie thinking about diving into a '65 GMC 1000
Going back to when you first posted pictures of your truck. I noticed that it had the smaller 230/250 radiator mounted in the forward position where the larger 292/ v8 radiator should set. Is your truck still set up this way? If so that may be part of the overheating problem. The 230/250 radiator is narrower and it is more than likely letting air flow around the outside of the radiator than through it. What do the rest of you guys think?
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Re: Newbie thinking about diving into a '65 GMC 1000
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https://lh3.googleusercontent.com/S-...E=w800-h643-no |
Re: Newbie thinking about diving into a '65 GMC 1000
If you can get a larger 292 or v8 radiator I would consider. I went aluminum dual core on my 64 GMC with a big block v8 and that thing Never gets above 190. The only time the temp gauge Finally hit Norm was when I was towing 10K on a hot day. lol
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Re: Newbie thinking about diving into a '65 GMC 1000
Are the baffles significant in the cooling performance? Looks like I could grab a set for around $50 (which feels a bit pricey at first glance)
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Re: Newbie thinking about diving into a '65 GMC 1000
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To put the radiator that you have back where it belongs. You would need a radiator shroud that bolts to the cowl panel between it and the radiator, and a upper radiator support for the smaller radiator along with a set of smaller rubber radiator cushions. Here are some photos of a GMC parts truck that I bought recently that was set up like yours was from the factory. Sorry but before you ask, No I'm not trying to sell these parts on the board. I'm just trying to show you how it was set up.
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Re: Newbie thinking about diving into a '65 GMC 1000
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Here are some photos of the parts you need after they have been removed from the truck.
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Re: Newbie thinking about diving into a '65 GMC 1000
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Re: Newbie thinking about diving into a '65 GMC 1000
Right now the question is, will the radiator have enough clearance to the 6-blade fan the PO installed. It looks larger than the stock 4 blade.
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Re: Newbie thinking about diving into a '65 GMC 1000
You might be better off getting a V8 radiator since you already have the mounts for it (and yours may be half plugged looks like over heating has been a problem for the PO also) ....The L6 parts you need may be hard to find.. As for the fan hard to see in pics but you may be-able to use a thinner spacer between the fan and water pump
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Re: Newbie thinking about diving into a '65 GMC 1000
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My maintenance manual lists a handful of things to check for overheating and I'm still working my way through the list. Timing light is on the way, and I also need to adjust idle speed and mix. |
Re: Newbie thinking about diving into a '65 GMC 1000
Here's a closer look at the radiator brackets and fan I do have. The radiator can rattle around as it stands now so these don't appear to be the I6 brackets.
https://lh3.googleusercontent.com/ty...w=w300-h973-no https://lh3.googleusercontent.com/pd...s=w600-h973-no https://lh3.googleusercontent.com/5v...x=w300-h973-no |
Re: Newbie thinking about diving into a '65 GMC 1000
Yes that's a V8 upper bracket the tanks are wider...At some point in the trucks life someone has put a V8 rad in there as you can see with the lower brackets (also wider than L6) you can NOT put the L6 rad in the correct place with the higher and slightly forward (lower) brackets in there
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Re: Newbie thinking about diving into a '65 GMC 1000
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My top bracket is differently shaped than what 65 GMC showed in his pic, as well. https://lh3.googleusercontent.com/6x...I=w300-h950-no |
Re: Newbie thinking about diving into a '65 GMC 1000
WELL actually I am blind in my left eye but I do have 20/10 in my right
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Re: Newbie thinking about diving into a '65 GMC 1000
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Working my way through what my maintenance manual says regarding overheating. For anyone else's reference, here it is.
I've crossed off a, c, d, e, and f (I think). My new belt tension gauge just arrived, along with the timing light, so b and g are next. I slapped the gauge on there and the belt tension is around 50 lbs, which is much too loose, so when it cools off outside a bit I will adjust the tension correctly and move on to timing if I have time tonight. I'm wondering if I can fashion a temporary upper radiator mount somehow until I can find a stock one for my radiator. This would allow me to at least try the correct lower position. |
Re: Newbie thinking about diving into a '65 GMC 1000
Checked the timing, and it was about 12 degrees retarded. I set it to 4 degrees advanced, and holy hell what a huge difference.
Overheating issue appears to be resolved and the truck runs so much better now. :metal: |
Re: Newbie thinking about diving into a '65 GMC 1000
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Re: Newbie thinking about diving into a '65 GMC 1000
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https://lh3.googleusercontent.com/tv...Y=w600-h989-no |
Re: Newbie thinking about diving into a '65 GMC 1000
So I was trying to adjust the Rochester model b carb this evening prior to setting the timing, but my service manual stumped me. It's instructions were to:
1. Disconnect spark advance at distributor and plug opening of tube. 2. Connect tachometer at coil. 3. Connect vacuum gauge to manifold. 4. With engine running (choke wide open) adjust idle speed screw to bring idle speed to 450-500 rpm (Pow-R-Flo in drive, manual transmission in neutral). 5. Adjust idle mixture screw to obtain highest steady vacuum at idle speed. I couldn't figure out where to connect a vacuum gauge. I assume this is NOT talking about the vacuum advance line from the carb to the distributor, because at idle that should not be pulling a vacuum. Can anyone point me to exactly where I hook up the vacuum gauge? |
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