| [GMCnet] Got an Olds 307 aluminum intake manifold coming Thursday for my 403 [message #311890] |
Sat, 07 January 2017 20:57  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Amazingly my main interest in an aluminum manifold was that I needed to pull out the stock iron manifold. And didn't want to put that heavy thing back on. Now this idea has brought up some other issue when installing EFI on my 403. And these same issue would be involved with an iron, or aluminum manifold anyway. You have to install a 3/8 inch adapter to mount the TB. And I don't like the turbulence that is creates due to the adapters alignment with the intakes carb ports. I want to uses the stock air filter. The adapter moves the air filter into the distributor. So I'm thinking of machining out the aluminum intake were the 4 holes are for the carb ports. Then weld in an aluminum 3/8ths inch mount down in the manifold for the TB. Thus this will lower the TB. Then I can move the TB to were I want it to be. Bob Dunahugh 78 Royale Mouse House
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| Re: [GMCnet] Got an Olds 307 aluminum intake manifold coming Thursday for my 403 [message #311891 is a reply to message #311890] |
Sun, 08 January 2017 08:18  |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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[quote title=BobDunahugh wrote on Sat, 07 January 2017 20:57... So I'm thinking of machining out the aluminum intake were the 4 holes are for the carb ports. Then weld in an aluminum 3/8ths inch mount down in the manifold for the TB. Thus this will lower the TB. Then I can move the TB to were I want it to be. Bob Dunahugh 78 Royale Mouse House
[/quote]
That is doable Bob but I'd caution you to find a really good welder. Due to the expansion of aluminum as it heats, I'd be concerned about getting a good weld that doesn't have porosity and cracks. Can you say
'vacuum leaks'?
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] Got an Olds 307 aluminum intake manifold coming Thursday for my 403 [message #311895 is a reply to message #311894] |
Sun, 08 January 2017 09:49 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Welded lots of castings. Cylinder heads sand cast in aluminum, similar
intake manifolds. Castings need to be squeaky clean. Preheat the whole
casting in an oven to 400° F, and rest it on fire bricks, as flat as
possible. Weld while the casting is as hot as possible, when finished, put
it back into the oven, and gradually lower Temps 100° at a time. Cool
slowly out of drafts. Not saying this will eliminate warping, just minimize
it. Some mating surfaces may require machine work following welding. No
fool proof method exists for prevention.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Jan 8, 2017 7:31 AM, "Pete Smith" wrote:
> I'd worry about distortion of the manifold......
> And not all grades of aluminium are weldable and since it conducts heat
> away so fast you really need to heat the whole part up to get a good weld in
> any case.....
>
> Pete
>
> --
> Cary, NC
>
> No Coach yet but likely center kitchen, dry side bath Royale, 78, 403,
> hopefully with good original white Imron paint.
>
> _______________________________________________
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| Re: [GMCnet] Got an Olds 307 aluminum intake manifold coming Thursday for my 403 [message #311900 is a reply to message #311890] |
Sun, 08 January 2017 16:02 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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When we did cylinder heads and cases at Mac's, we took them up to 400 - 450 in the oven and then gave them to the welders. Back in the oven to cool slowly overnight. All the welds were going to be machined anyway, warpage wasn't a great problem. It did take a welder who knew what he was doing (not me), all done in Heliarc.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Got an Olds 307 aluminum intake manifold coming Thursday for my 403 [message #311904 is a reply to message #311890] |
Sun, 08 January 2017 16:52 |
Len Novak
Messages: 676
Registered: February 2004
Location: Las Vegas, NV
Karma: -3
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Just found a 3711 in the shed
Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule@Roadrunner.Com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Bob
Dunahugh
Sent: Saturday, January 07, 2017 6:57 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Got an Olds 307 aluminum intake manifold coming Thursday
for my 403
Amazingly my main interest in an aluminum manifold was that I needed to pull
out the stock iron manifold. And didn't want to put that heavy thing back
on. Now this idea has brought up some other issue when installing EFI on my
403. And these same issue would be involved with an iron, or aluminum
manifold anyway. You have to install a 3/8 inch adapter to mount the TB.
And I don't like the turbulence that is creates due to the adapters
alignment with the intakes carb ports. I want to uses the stock air filter.
The adapter moves the air filter into the distributor. So I'm thinking of
machining out the aluminum intake were the 4 holes are for the carb ports.
Then weld in an aluminum 3/8ths inch mount down in the manifold for the TB.
Thus this will lower the TB. Then I can move the TB to were I want it to be.
Bob Dunahugh 78 Royale Mouse House
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Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Las Vegas, NV new email: B52sRule@Gmail.com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
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| Re: [GMCnet] Got an Olds 307 aluminum intake manifold coming Thursday for my 403 [message #311932 is a reply to message #311890] |
Mon, 09 January 2017 18:11 |
cbryan
Messages: 451
Registered: May 2012
Location: Ennis, Texas
Karma: 3
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Senior Member |
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Yes, Kerry,
I resemble that allegation, but don't have a TIG. I think really compared, to you Kerry, there are loads of jacklegs driving and modifying GMCs and having a ball! No offense taken.
Good to hear from you even though you drive a non-GMC. How is it going with that unit?
Carey
Carey from Ennis, Texas
78 Royale, 500 Cadillac, Rance Baxter EFI.
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| Re: [GMCnet] Got an Olds 307 aluminum intake manifold coming Thursday for my 403 [message #311933 is a reply to message #311932] |
Mon, 09 January 2017 19:28 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Senior Member |
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cbryan wrote on Mon, 09 January 2017 18:11Yes, Kerry,
I resemble that allegation, but don't have a TIG. I think really compared, to you Kerry, there are loads of jacklegs driving and modifying GMCs and having a ball! No offense taken.
Good to hear from you even though you drive a non-GMC. How is it going with that unit?
Carey
I wouldn't classify you as a jackleg either Wally. But while I might try this on my own coach, I certainly wouldn't do it on anyone elses.
I learned something about the definition of Jackleg also. I always thought it meant someone not trained or very skilled, ie amateur, basically, the equivalent to a not very good shadetree mechanic. However, another definition is "characterized by unscrupulousness, dishonesty, or lack of professional standards <a jackleg lawyer> " I certainly was not comparing anyone here to the dishonest definition.
That said, we all know the guy in the area who can stick metal together even if it looks like bubble gum. That's a jackleg welder.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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