350h.o.

Reply Subscribe

Thread Tools

Search this Thread

07-10-2003, 05:22 PM

2kickassbirds

Member

Thread Starter

iTrader: (3)

Join Date: Nov 2002

Location: Tucson

Posts: 437

Likes: 0

Received 0 Likes on 0 Posts

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

Reply Like

07-11-2003, 02:16 PM

RaGe

Member

Join Date: Jan 2002

Posts: 188

Likes: 0

Received 0 Likes on 0 Posts

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...

Reply Like

07-13-2003, 04:33 AM

Matt_Ky

Member

Join Date: Nov 1999

Location: Northern KY

Posts: 216

Likes: 0

Received 0 Likes on 0 Posts

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?

Reply Like

07-13-2003, 05:30 PM

RaGe

Member

Join Date: Jan 2002

Posts: 188

Likes: 0

Received 0 Likes on 0 Posts

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.

Reply Like