GMCforum: GMCnet » [GMCnet] How about putting a 454 TB on a EFI port injection aluminum intake manifold.

Home » Public Forums » GMCnet » [GMCnet] How about putting a 454 TB on a EFI port injection aluminum intake manifold.

Show: Today's Messages :: Polls :: Message Navigator

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

Tue, 25 October 2016 23:52

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

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
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Report message to a moderator

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

Karma: 0

Senior Member

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...

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Report message to a moderator

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

Messages: 1411
Registered: November 2013

Karma: 5

Senior Member

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.

Report message to a moderator

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

Messages: 643
Registered: August 2004
Location: Omaha Nebraska

Karma: 5

Senior Member

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
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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

Report message to a moderator

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

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

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
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Report message to a moderator

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

Karma: 0

Senior Member

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

Report message to a moderator

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

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

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
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

Report message to a moderator

Previous Topic:	Easiest way?
Next Topic:	Looking for Rear Cap

Goto Forum:

-=] Back to Top [=-

Current Time: Tue Nov 19 04:27:29 CST 2024

Total time taken to generate the page: 0.01684 seconds