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Can I run a 454 Throttle body on a 350?

Old May 29, 2014 | 09:33 PM
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MustangBeater20's Avatar
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From: Land Of 10,000 Lakes
Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
Can I run a 454 Throttle body on a 350?

I'm building a 350 with vortec heads, a bigger cam, and a air gap intake. Can I put a 454 throttle body on it for more cfm?
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Old May 29, 2014 | 11:26 PM
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From: 51°N 114°W, 3500'
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Re: Can I run a 454 Throttle body on a 350?

Yes but you need an adapter plate. The bolt pattern is different because the TBI is larger. A BBC TBI will not directly bolt onto a SBC intake manifold.
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Old May 29, 2014 | 11:29 PM
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MustangBeater20's Avatar
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From: Land Of 10,000 Lakes
Car: 1991 Camaro RS
Engine: Built TBI 350
Transmission: T-5
Axle/Gears: 3.42 Posi
Re: Can I run a 454 Throttle body on a 350?

Originally Posted by AlkyIROC
Yes but you need an adapter plate. The bolt pattern is different because the TBI is larger. A BBC TBI will not directly bolt onto a SBC intake manifold.
I already have an adapter plate for it
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Old May 30, 2014 | 07:34 AM
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Can I run a 454 Throttle body on a 350?

Originally Posted by AlkyIROC
Yes but you need an adapter plate. The bolt pattern is different because the TBI is larger. A BBC TBI will not directly bolt onto a SBC intake manifold.
The bolt pattern is the same. The issue is the throttle bore size. If you just bolt a 454 TBI onto a stock 350 manifold, the 454 TBI will no open.

Boat engines, including 4.3s ran the 454 TBI on them.
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