305 to 350 TBI
12-06-2004, 12:18 AM
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Car: 1991 Pontiac Firebird
Engine: 305 TBI
Transmission: 700-R4
Axle/Gears: 2.73?
305 to 350 TBI
ok so I know this could be a waste of money and time but what if I swapped in a 350 for my 305 TBI and left the stock TBI system? I know I would need more fuel to compensate for more air being added. So I was wondering if I can keep the 305 TBI set up and get more fuel to the mixture by adding either a regulator or higher flowing pump. The only reason I would do this is so I don't have to buy the 350 computer and emissions stuff. And if I added TPI heads, being that they are not the swirl port, would I need 2 cats if I keep TBI? If all else fails I would just try TPI intake and such. Thanks 
12-06-2004, 01:37 AM
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Car: 2002 Z28
Engine: LS1
Transmission: 4L60E
Axle/Gears: 3.23
The 305 and 350 TBI setups use the same intake manifold, tbi, and computer. The only difference is that the 350 uses a different chip, bigger injectors, and youll have to get a knock sensor ESC Module for a 350 engine. You can use TPI heads with no problem but you might have to do some EPROM tuning to get it to run right.
12-06-2004, 05:36 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by vjo90RS8
The 305 and 350 TBI setups use the same intake manifold, tbi, and computer. The only difference is that the 350 uses a different chip, bigger injectors, and youll have to get a knock sensor ESC Module for a 350 engine. You can use TPI heads with no problem but you might have to do some EPROM tuning to get it to run right.
The 305 and 350 TBI setups use the same intake manifold, tbi, and computer. The only difference is that the 350 uses a different chip, bigger injectors, and youll have to get a knock sensor ESC Module for a 350 engine. You can use TPI heads with no problem but you might have to do some EPROM tuning to get it to run right.
12-07-2004, 10:27 PM
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you can PM me for details 
i did that, and i dont have a tuned chip, and a 305TBI can beat me... im in the process of fixing it. I wish i woulda listened to them when they told me the same thing... if you have patience, you might as well wait and build a better motor... you notice a big difference in the bottom end torque, but thats just about it... and, the open element sounds different.
i did that, and i dont have a tuned chip, and a 305TBI can beat me... im in the process of fixing it. I wish i woulda listened to them when they told me the same thing... if you have patience, you might as well wait and build a better motor... you notice a big difference in the bottom end torque, but thats just about it... and, the open element sounds different. 
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