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[GMCnet] How about putting a 454 TB on a EFI port injection aluminum intake manifold. [message #309435]

Tue, 25 October 2016 23:52

BobDunahugh

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Registered: October 2010
Location: Cedar Rapids, IA

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I have an aluminum port injection manifold with all related parts on it. So strip it down. Some modifications. And put the 454 TB on it. Any thoughts?

Bob Dunahugh 78 403
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Re: [GMCnet] How about putting a 454 TB on a EFI port injection aluminum intake manifold. [message #309436 is a reply to message #309435]

Wed, 26 October 2016 00:38

kelvin

Messages: 608
Registered: February 2004
Location: Eugene, OR

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On 10/25/2016 9:52 PM, Bob Dunahugh wrote:
> I have an aluminum port injection manifold with all related parts on it. So strip it down. Some modifications. And put the 454 TB on it. Any thoughts?
>
> Bob Dunahugh 78 403
> _______________________________________________

Sounds like weeks of work and then you have to hope the fuel map works
reasonably well on a 12,000 motorhome.

Kelvin
'73 23' in Eugene, OR with most of a FiTech TB installed in 10 hours...

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Re: [GMCnet] How about putting a 454 TB on a EFI port injection aluminum intake manifold. [message #309438 is a reply to message #309436]

Wed, 26 October 2016 01:26

Bullitthead

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Registered: November 2013

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Sounds like a great experiment if you have the time to futz around with it and don't need to take any long trips in the GMC anytime soon. Tuning that setup could be instant gratification or a nightmare that lasts and lasts. Why not try your 454 throttle body injector on the stock manifold to see how well your pump/throttle body/engine combo works together. Or sell that manifold to a hot rodder that wants a port setup before you have to make any irreversible changes to it and apply the funds to the FiTech setup. Several GMCers will have plenty of installation advice Smile

Terry Kelpien ASE Master Technician 73 Glacier 260 Smithfield, Va.

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Re: [GMCnet] How about putting a 454 TB on a EFI port injection aluminum intake manifold. [message #309440 is a reply to message #309435]

Wed, 26 October 2016 05:24

wally

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Registered: August 2004
Location: Omaha Nebraska

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BobDunahugh wrote on Tue, 25 October 2016 23:52

I have an aluminum port injection manifold with all related parts on it. So strip it down. Some modifications. And put the 454 TB on it. Any thoughts?

Bob Dunahugh 78 403
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If I remember the factory 403 port injection manifold was a very open design with no runners like a tbi or carb manifold has. They didn't have to try and get equal fuel distribution as the injectors at each port took care of that. No provision for manifold heat either. That said why not go multiport? EBL would control that in batch fire and tune itself. You could still use 454 TB as an air valve and use its idle air control and throttle position sensor, just omit the injectors.

Wally Anderson
Omaha NE
75 Glenbrook

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Re: [GMCnet] How about putting a 454 TB on a EFI port injection aluminum intake manifold. [message #309465 is a reply to message #309435]

Wed, 26 October 2016 19:02

BobDunahugh

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Registered: October 2010
Location: Cedar Rapids, IA

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Well it seems that no one has tried it. And there are air/fuel issues. So it seems that putting that 573lbs iron intake manifold back in place is what I need to do. Or is it 673lbs of iron?

Bob Dunahugh 78 403
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Re: [GMCnet] How about putting a 454 TB on a EFI port injection aluminum intake manifold. [message #309467 is a reply to message #309435]

Wed, 26 October 2016 19:26

winter

Messages: 247
Registered: September 2007
Location: MPLS MN

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I'm putting a 76 iron intake and large bore throttle body on my 77 403. It will be controlled by a FAST multiport controller with dual sync distributor. It's been in process for a while but I hope to have done next year. The intake and throttle body came off a 76 seville. The throttle body is identical to the cadillac 500.

Jerrod Winter
1977 Palm Beach
Green Jelly Bean
Twin Cities, Minnesota

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Re: [GMCnet] How about putting a 454 TB on a EFI port injection aluminum intake manifold. [message #309468 is a reply to message #309467]

Wed, 26 October 2016 19:39

jimk

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Registered: July 2006
Location: Belmont, CA

Karma: 9

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So you have the port injection manifold, correct?
Put in a 3.70 final drive and it should perform well.

On Wed, Oct 26, 2016 at 5:26 PM, jerrod winter wrote:

> I'm putting a 76 iron intake and large bore throttle body on my 77 403.
> It will be controlled by a FAST multiport controller with dual sync
> distributor. It's been in process for a while but I hope to have done
> next year. The intake and throttle body came off a 76 seville. The
> throttle
> body is identical to the cadillac 500.
> --
> Jerrod Winter
> 1977 Palm Beach
> Green Jelly Bean
> Twin Cities, Minnesota
>
> _______________________________________________
> GMCnet mailing list
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>

--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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