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Old 04-23-2017, 11:13 AM
yossarian19 yossarian19 is offline
258 I6
Join Date: Nov 13, 2016
Location: Grass Valley, CA
Posts: 402
AMC 4 barrel to TBI plate?

I have a 401 that is going to get 454 TBI slapped on it. Right now I'm on a four barrel intake with a Holley spread bore TBI adapter. If you are up on carbs, you already see the problem: the 4350 spread bore that AMC used is *not* the same spread bore that the Holley adapter was made for.
So, what's the solution here?
It looks like a die grinder might fix my problem.
Would a 2-barrel AMC intake work?
Edelbrock Performer intake?
Some other adapter that is designed for the AMC intake?
I got the Holley adapter free (birthday present) not realizing that "spread bore" wasn't sufficiently detailed. I don't want to spend $300 making a $60 part work, though.
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Old 04-23-2017, 11:41 AM
TexasJ10's Avatar
TexasJ10 TexasJ10 is offline
360 AMC
Join Date: Jan 03, 2002
Location: Houston, Texas
Posts: 2,774
Hamilton has good options for tbi adapters
* 1981 stepside, 360, 727, 208, almost stock daily driver.
* 1982 Laredo j-10, 360, 727, in rough shape and in the process of being rebuilt with 401, NV4500, Klune,
. NP205,d60 front, d70 rear, fender work and minimal lift. It will probably take 10 years
* 1973 jcab mounted on 1983 j20 frame. 360/t18/208 d44/d60. Almost completed
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Old 04-23-2017, 12:07 PM
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babywag babywag is offline
out of order
Join Date: Jun 08, 2005
Location: Land of froot loops and cukcoo-nuts, CA
Posts: 9,793
Get a hold of a square bore intake, I don't believe anyone makes an adapter for the amc motorcraft 4350 4bbl intake.
Plenty of used intakes out there if you don't want to pay for new.
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Old 04-23-2017, 08:32 PM
yossarian19 yossarian19 is offline
258 I6
Join Date: Nov 13, 2016
Location: Grass Valley, CA
Posts: 402
Hah! It looked like there was no way it would fit, with 1/4" or so of intake manifold showing under the adapter plate.
The 454 TBI unit can open all the way with no interference, though, so it'll run.
I'm going to use a die grinder to smooth the transition from adapter to intake manifold to minimize the harm there and eventually I'm going to buy an aluminum intake manifold - but it'd work with *zero* mods.
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Old 04-24-2017, 04:45 PM
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Blinkinlights Blinkinlights is offline
Grease Monkey
Join Date: Sep 19, 2004
Location: Edmonton, AB Canada
Posts: 407
Transdapt 2199 will go from AMC/Ford spreadbore to Holley square bore.
87 Grand Wagoneer 360/727/NP208
BJ's Front and Rear Dozer Bumpers
35x14.5x15 Boggers on 15x10's
Mile Marker H10500 Hydraulic Winch

It's all fun and games until someone breaks a woodie.
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Old 04-26-2017, 07:29 AM
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Woodchomper Woodchomper is offline
350 Buick
Join Date: Dec 17, 2002
Location: Saint Charles, Missouri
Posts: 923
Whatever adapter you end up using make sure the TBI unit fits properly. The newer 454 TBI have a larger base. Check out the pictures in the link below:
1991 GW 401 /727TF/NP229 /4" Skyjacker /EBL TBI /CS-144
1981 J10 401 /727TF/NP208 /6" Superlift /CS-144
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Old 05-07-2017, 11:16 AM
Bill USN-1 Bill USN-1 is offline
258 I6
Join Date: Nov 11, 2006
Location: Oak Harbor, Wa
Posts: 360
Bill USN-1
Fuel Injection Moderator at BinderPlanet
Hamilton Fuel Injection
75 scout XLC 345/727/JPD300/3.73's/33's/4wdisc/hydroboost/EFI/OBA/OBW
1977 Innocenti 1001 (Italian Mini)EFI 1275/DIS
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Old 05-07-2017, 07:31 PM
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Mr. Wilson Mr. Wilson is offline
Join Date: Feb 23, 2016
Location: Oswego KS
Posts: 18
I got mine from Bill at binder planet. I put it directly onto the spread bore intake in the 76 and put the TBI straight onto the adapter. I drove it to and from work today, about 75 miles. It works great and if you tell him spread bore he'll send the correct gasket. I would call Bill at binder planet, his adapter is top notch. Heck it looks like it's aircraft grade.
76 Wagoneer 360/T400/QT
69 F100 SWB 390/5 speed
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