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back to my one ton,,,,
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desertjoe View Drop Down
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Joined: 23 Sep 2013
Location: New mexico
Points: 13766 		Post Options Post Options   Thanks (0) Thanks(0)   Quote desertjoe Quote  Post ReplyReply Direct Link To This Post Topic: back to my one ton,,,,
    Posted: 23 Mar 2026 at 10:30am
 If I remember correctly,,,I have a 1989 GMC one ton trk with a 454 Automatic and the dreaded TBI. I would like to change the TBI to a 4 barrel carburator and remove all the extra BS that has to be almost perfect for the frigging TBI to run correctly.
 I'm positive that with so many DIY's on this site ,,,that many have already done this conversion successfully,,,!!!
 I don't have a manifold yet but do have several Holly carbs from 650 to 1200 CFM.
 Anyone wanna share some knowledge,,,??? Many Thanks in advanceClapClap
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HudCo View Drop Down
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 4065 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 2026 at 10:48am
you will need to change the fuel pump so you dont over presure all of it and have a  fire
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desertjoe View Drop Down
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Joined: 23 Sep 2013
Location: New mexico
Points: 13766 		Post Options Post Options   Thanks (0) Thanks(0)   Quote desertjoe Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 2026 at 1:13pm
 Hey Thanks HudCo,,, Chit,,,and I had just installed a new in tank unit,,,,,,
 
   Whoops,,lookin like more work,,,mayhaps an in-line pressure regulator set at ,,,??
 
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plummerscarin View Drop Down
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Joined: 22 Jun 2015
Location: ia
Points: 4170 		Post Options Post Options   Thanks (0) Thanks(0)   Quote plummerscarin Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 2026 at 3:20pm
Regulator was my thinking, around 5PSI
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jaybmiller View Drop Down
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 25208 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 2026 at 3:41pm
Maybe find a 'donor' truck with 454/carb setup ??
3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water
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8070nc View Drop Down
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Joined: 21 Mar 2019
Location: North Carolina
Points: 719 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 8070nc Quote  Post ReplyReply Direct Link To This Post Posted: 17 hours 25 minutes ago at 9:07pm
Ive got a 88 3500 gmc i did all that too. Got a edelbrick aluminun intake and fuel pressure regulator from jegs. Got a stage 2 quadrajet from national carbureator. Put a hei ditributor in it. Its geared 4.56 so i put a 4l80e in it. Now its trouble free and is sweet as sugar
1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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Joined: 21 Mar 2019
Location: North Carolina
Points: 719 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 8070nc Quote  Post ReplyReply Direct Link To This Post Posted: 17 hours 23 minutes ago at 9:09pm
PS. People want to buy it all the time but it not for sale at any price
1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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