350h.o.

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Jul 10, 2003 | 05:22 PM

2kickassbirds

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Joined: Nov 2002

Posts: 437

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From: Tucson

Car: 1991 firebird formula

Engine: 5.8

Transmission: 700r4

Axle/Gears: 3.42

350h.o.

Can anyone tell me what it will take to convert my 1989 firebird 305tbi to a 350H.O. motor with tbi

Jul 11, 2003 | 02:16 PM

RaGe

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Joined: Jan 2002

Posts: 188

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Car: 1990 Firebird Formula

Engine: LT1

Transmission: T56

Axle/Gears: 3.42

Vortec carb intake, holley carb to tbi adaptor, custom prom, holley 670 tbi, and headers (not necessary but the car won't run worth a darn without them)

look in the tbi board for jprevost, then find his website... hes got all the parts listed and the whole swap documented, i believe...

Jul 13, 2003 | 04:33 AM

Matt_Ky

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Joined: Nov 1999

Posts: 216

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From: Northern KY

Car: 1998 Camaro Z28

Engine: LS1

Transmission: 4L60E

Axle/Gears: 3.23

Could you not run the GM Vortec intake for TBI, part # 12496821?
Then run a factory/stock GM TBI and ECM used on 350 trucks?

Jul 13, 2003 | 05:30 PM

RaGe

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Joined: Jan 2002

Posts: 188

Likes: 1

Car: 1990 Firebird Formula

Engine: LT1

Transmission: T56

Axle/Gears: 3.42

You could get away with the stock components I'm sure, but it wouldn't run to its potential. The GM TBI Vortec intake I believe has EGR, but if you run with out EGR you need a modified PCM.

Also I think the stock TBI would need bigger injectors, or possibly a fuel pressure regulator. The Ultimate TBI mods would not hurt either.

I do believe however that the TBI Vortec Intake costs more then the Carb Intake with the adapter. I would also be willing to bet that the carb intake would make more power.