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305tbi to 350tbi swap

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Old Dec 16, 2007 | 10:23 PM
  #1  
Pontiackid's Avatar
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From: appleton,WI
Car: trans am ws6
Engine: something special :)
Transmission: T56
Axle/Gears: 4.10 posi
305tbi to 350tbi swap

i know this has been covered thousands of times, and i search and i read different everytime on what is needed.

i have a 350 tbi engine here in my garage. what is needed/required for me to put the 350 tbi engine in my car, in place of the 305tbi now. the 350 is a complete motor, runs right now.
thanks
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Old Dec 16, 2007 | 10:27 PM
  #2  
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From: Elverta, California
Car: 1988 Z28 Camaro
Engine: TPI 350
Transmission: TH350
Axle/Gears: 3.73 10 bolt
Re: 305tbi to 350tbi swap

this is perfect cuz im doing the same thing next week to my car. so ill go along with what is said. Thanx
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Old Dec 17, 2007 | 10:26 AM
  #3  
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From: San Antonio, Tx.
Car: 88 Camaro SC
Engine: Aluminum Vortec headed 383 roller
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt/3.27
Re: 305tbi to 350tbi swap

You will need a knock sensor for a 350 and an ESC module for a 350. You'll also need some 55lb. injectors to swap in place of the 45lb. injectors or you can get an adjustable fuel pressure regulator and turn up the fuel pressure. It's easier to just swap in the 55lb. injectors. That's all you'll need to swap it in. In order to get it to run better in your car you might need to do some reprogramming in the ECM. But I don't think it would take much on a stock 350 using the 55lb. injectors.

Gene
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Old Dec 17, 2007 | 12:46 PM
  #4  
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From: Elverta, California
Car: 1988 Z28 Camaro
Engine: TPI 350
Transmission: TH350
Axle/Gears: 3.73 10 bolt
Re: 305tbi to 350tbi swap

not much work at all. Thanx for the info. Whats esc???
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Old Dec 17, 2007 | 09:13 PM
  #5  
BMmonteSS's Avatar
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From: Buckhannon, WV
Car: 84' Monte
Engine: 350
Transmission: 700-r4
Axle/Gears: ferd 9" posi 3.50 gears
Re: 305tbi to 350tbi swap

You can "get away with" just 350 injectors and a 350 chip. After that it's a very good idea to get the 350 knock sensor and spark module.

No matter what you do make sure you get the chip and injectors....it'll run like poo if you don't.
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Old Dec 17, 2007 | 09:55 PM
  #6  
Pontiackid's Avatar
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From: appleton,WI
Car: trans am ws6
Engine: something special :)
Transmission: T56
Axle/Gears: 4.10 posi
Re: 305tbi to 350tbi swap

i already have the injectors on this 350 i have, wouldnt them work? also the chip would that be the ecm or the computer or what?
thanks
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Old Dec 18, 2007 | 08:47 PM
  #7  
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From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Re: 305tbi to 350tbi swap

The "chip" is the removeable PROM chip inside the computer, behind the panel that you remove with the two screws on the face of the ECM. Most guys like to run the 350 TBI PROM with the 350 engine. I run the 305 computer and PROM chip stock and turn up the fuel pressure, along with using the 350 ESC module and knock sensor.

That's just me...
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Old Dec 19, 2007 | 10:01 AM
  #8  
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From: San Antonio, Tx.
Car: 88 Camaro SC
Engine: Aluminum Vortec headed 383 roller
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt/3.27
Re: 305tbi to 350tbi swap

Originally Posted by travishenry
not much work at all. Thanx for the info. Whats esc???

ESC is an acronym for Electronic Spark Control. It's a little module that's on the driver's side firewall. It's a little hidden but you can spot it if you know what it looks like and it's easy to swap.
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Old Dec 19, 2007 | 10:37 AM
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Re: 305tbi to 350tbi swap

make sure the "chip" is for transmission application(auto/man).
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Old Dec 20, 2007 | 04:57 PM
  #10  
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From: Elverta, California
Car: 1988 Z28 Camaro
Engine: TPI 350
Transmission: TH350
Axle/Gears: 3.73 10 bolt
Re: 305tbi to 350tbi swap

Ok ya i swapped those b4 i just didnt know what the name was 4 thanx.
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