Home » Public Forums » GMCnet » [GMCnet] Toronado Intake Manifold Height
| [GMCnet] Toronado Intake Manifold Height [message #200199] |
Thu, 28 February 2013 16:55  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
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G'day,
I just posted a photo of how to calculate the intake manifold height for a GMC.
http://www.gmcmhphotos.com/photos/random-photos/p47792-gmc-toronado-intake.html
This should come in handy to calculate how much you'll have to raise the engine cover f you change to an aftermarket manifold.
Please review it and to make sure my logic and calculations are correct.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200204 is a reply to message #200199] |
Thu, 28 February 2013 17:37  |
Dennis S
Messages: 3046
Registered: November 2005
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| Robert Mueller wrote on Thu, 28 February 2013 16:55 |
G'day,
I just posted a photo of how to calculate the intake manifold height for a GMC.
http://www.gmcmhphotos.com/photos/random-photos/p47792-gmc-toronado-intake.html
This should come in handy to calculate how much you'll have to raise the engine cover f you change to an aftermarket manifold.
Please review it and to make sure my logic and calculations are correct.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
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Rob
If the carb pad and the thermostat flat are parallel then I think your calculations are correct.
Anyone considering the space may want to look at the front body pads since their thickness affects the room. And we have seen coaches that did not have the relief cut correctly into the hatch cover.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
[Updated on: Thu, 28 February 2013 18:30] Report message to a moderator |
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200207 is a reply to message #200204] |
Thu, 28 February 2013 17:45 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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| Dennis S wrote on Thu, 28 February 2013 17:37 |
| Robert Mueller wrote on Thu, 28 February 2013 16:55 |
G'day,
I just posted a photo of how to calculate the intake manifold height for a GMC.
http://www.gmcmhphotos.com/photos/random-photos/p47792-gmc-toronado-intake.html
This should come in handy to calculate how much you'll have to raise the engine cover f you change to an aftermarket manifold.
Please review it and to make sure my logic and calculations are correct.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
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Rob
If the carb pad and the thermostat flat are parallel then I think your calculations are correct.
Anyone considering the space may want to look at there front body pads since their thickness affects the room. And we have seen coaches that did niot have the relief cut correctly into the hatch cover.
Dennis
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Oops, resent with message.
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200232 is a reply to message #200211] |
Thu, 28 February 2013 21:38 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Rob,
It does not change your final answer -- but I believe you have A and B reversed for the Toronado intake.
Interesting to note that B minus A for the performer is 1.10 and for the Toronado 1.38 suggesting that the carb would sit at a different angle.
Dennis
| Robert Mueller wrote on Thu, 28 February 2013 18:04 |
Dennis,
Good point, yes they are.
Here are calculations comparing the OEM Toronado manifold and Edelbrock Performer:
Edelbrock:
A = 4.40"
B = 5.50"
A (4.40) + B (5.50) = 9.90
9.90 / 2 = 4.95
OEM Toronado:
A = 2.72"
B = 1.34"
A (2.72) + B (1.34) = 4.06
4.06 / 2 = 2.03
The carb pad on the Performer is 2.92" higher. That sounds right as IIRC it has been noted here that you need to build a dog house
that's 4.00 high to fit one.
Regards,
Rob M.
-----Original Message-----
From: Dennis Sexton
> Rob
>
> If the carb pad and the thermostat flat are parallel then I think your calculations are correct.
>
> Anyone considering the space may want to look at there front body pads since their thickness affects the room. And we have seen
coaches that did niot have the relief cut correctly into the hatch cover.
>
> Dennis
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200243 is a reply to message #200232] |
Fri, 01 March 2013 07:05 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Dennis,
You’re right, I've edited the text a bit, how's it look now?
http://www.gmcmhphotos.com/photos/random-photos/p47792-gmc-toronado-intake-manifold-height.html
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dennis Sexton
Sent: Friday, March 01, 2013 2:38 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Toronado Intake Manifold Height
Rob,
It does not change your final answer -- but I believe you have A and B reversed for the Toronado intake.
Interesting to note that B minus A for the performer is 1.10 and for the Toronado 1.38 suggesting that the carb would sit at a
different angle.
Dennis
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200245 is a reply to message #200243] |
Fri, 01 March 2013 08:11 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Rob,
Looks great. Thank you for documenting the differences.
How does the Performer work with a 403? Do I remember correctly that you do not need to raise the hatch? If correct, there is certainly a lot of head space in the engine compartment with the 403 -- which I presume should affect vapor lock, under floor heat and general compartment heat.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200271 is a reply to message #200245] |
Fri, 01 March 2013 15:15 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Dennis,
Thanks for reviewing it and you're welcome.
When I was buying parts for the Caddy 500 Jerry Potter (the Joe Mondello of Caddy 500's) told me that a Performer on a Caddy 500
would get me about 40 HP. He did not say in what rpm range, however. I'd guess it would be in the higher range.
Regards,
Rob M.
-----Original Message-----
From: Dennis Sexton
Rob,
Looks great. Thank you for documenting the differences.
How does the Performer work with a 403? Do I remember correctly that you do not need to raise the hatch? If correct, there is
certainly a lot of head space in the engine compartment with the 403 -- which I presume should affect vapor lock, under floor heat
and general compartment heat.
Dennis
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Unsubscribe or Change List Options:
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200283 is a reply to message #200271] |
Fri, 01 March 2013 16:36 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Rob,
I thought perhaps it might be useful to include a link to SteveF's album on how to raise the hatch -- for those who may be interested in pursuing an Edelbrock manifold. They could also follow Steve's engine install to see how he routed fuel lines and fresh air intake hose. This way all the details are in one thread.
http://www.gmcmhphotos.com/photos/g4971-how-to-raise-the-hatch-cover.html
http://www.gmcmhphotos.com/photos/g4910-engine-replacement.html
Dennis
| Robert Mueller wrote on Fri, 01 March 2013 15:15 |
Dennis,
Thanks for reviewing it and you're welcome.
When I was buying parts for the Caddy 500 Jerry Potter (the Joe Mondello of Caddy 500's) told me that a Performer on a Caddy 500
would get me about 40 HP. He did not say in what rpm range, however. I'd guess it would be in the higher range.
Regards,
Rob M.
-----Original Message-----
From: Dennis Sexton
Rob,
Looks great. Thank you for documenting the differences.
How does the Performer work with a 403? Do I remember correctly that you do not need to raise the hatch? If correct, there is
certainly a lot of head space in the engine compartment with the 403 -- which I presume should affect vapor lock, under floor heat
and general compartment heat.
Dennis
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200284 is a reply to message #200245] |
Fri, 01 March 2013 16:42 |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
Karma: 0
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Senior Member |
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In my 403 OEM setup, the air cleaner is right up against the hatch. If the
Performer is any higher than the stock manifold, you would need to raise
the hatch.
On Fri, Mar 1, 2013 at 9:11 AM, Dennis Sexton <dennisfsexton@aol.com> wrote:
>
>
> Rob,
>
> Looks great. Thank you for documenting the differences.
>
> How does the Performer work with a 403? Do I remember correctly that you
> do not need to raise the hatch? If correct, there is certainly a lot of
> head space in the engine compartment with the 403 -- which I presume should
> affect vapor lock, under floor heat and general compartment heat.
>
> Dennis
>
> Robert Mueller wrote on Fri, 01 March 2013 07:05
> > Dennis,
> >
> > You re right, I've edited the text a bit, how's it look now?
> >
> >
> http://www.gmcmhphotos.com/photos/random-photos/p47792-gmc-toronado-intake-manifold-height.html
> >
> > Regards,
> > Rob M.
> > Sydney, Australia
> > AUS '75 Avion-The Blue Streak TZE365V100428
> > USA '75 Avion-Double Trouble TZE365V100426
> >
> > -----Original Message-----
> > From: gmclist-bounces@temp.gmcnet.org [mailto:
> gmclist-bounces@temp.gmcnet.org] On Behalf Of Dennis Sexton
> > Sent: Friday, March 01, 2013 2:38 PM
> > To: gmclist@temp.gmcnet.org
> > Subject: Re: [GMCnet] Toronado Intake Manifold Height
> >
> > Rob,
> >
> > It does not change your final answer -- but I believe you have A and B
> reversed for the Toronado intake.
> >
> > Interesting to note that B minus A for the performer is 1.10 and for the
> Toronado 1.38 suggesting that the carb would sit at a
> > different angle.
> >
> > Dennis
> >
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
> --
> Dennis S
> 73 Painted Desert 230
> Germantown, TN
> _______________________________________________
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Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200285 is a reply to message #200284] |
Fri, 01 March 2013 16:58 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| Mike Teets wrote on Fri, 01 March 2013 16:42 |
In my 403 OEM setup, the air cleaner is right up against the hatch. If the
Performer is any higher than the stock manifold, you would need to raise
the hatch.
|
Mike,
Thank you. I have not seen a 403 and believed that they had a similar low profile intake as the 455 -- now I realize they do not, so I can understand why your air cleaner fits up against the hatch.
and I looked at the Edelbrock intake specs for a 403 and see A is 2.50 and B is 3.90. I do not know the A and B specs on a factory 403 intake.
http://www.edelbrock.com/automotive_new/mc/manifolds/oldsmobile/performer-sb.shtml
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200952 is a reply to message #200284] |
Thu, 07 March 2013 20:59 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""In my 403 OEM setup, the air cleaner is right up against the hatch. If the
Performer is any higher than the stock manifold, you would need to raise
the hatch.""
That's correct. Unlike the 455, the 403 did not have a low rise specific intake. They have very minimal clearance to the cover.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Toronado Intake Manifold Height [message #200955 is a reply to message #200952] |
Thu, 07 March 2013 21:13 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Hi Bob -- welcome back!
And thank you for the information.
Dennis
| Bob de Kruyff wrote on Thu, 07 March 2013 20:59 |
""In my 403 OEM setup, the air cleaner is right up against the hatch. If the
Performer is any higher than the stock manifold, you would need to raise
the hatch.""
That's correct. Unlike the 455, the 403 did not have a low rise specific intake. They have very minimal clearance to the cover.
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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