TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

350 heads

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Old Aug 29, 2003 | 08:55 AM
  #1  
matt formula's Avatar
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From: Exton, PA
Car: 1990 firebird formula
Engine: V8 305 TBI
Transmission: TH700R4
350 heads

are the 305 and 350 heads the same?, if not will the 350 heads give me some more power out of my 305 tbi?
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Old Aug 29, 2003 | 04:21 PM
  #2  
del91_305's Avatar
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From: Kingsport,tn
Car: 1991 camaro RS
Engine: 305 Carb
Transmission: 700R4
What kind of car do you have? If its a H.O. engine it may already have 350 heads on it.
And as far as being the same, most of them are, i would look into getting vortec heads.
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Old Aug 29, 2003 | 10:34 PM
  #3  
matt formula's Avatar
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From: Exton, PA
Car: 1990 firebird formula
Engine: V8 305 TBI
Transmission: TH700R4
how do I know if I have an H.O. engine?
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Old Aug 29, 2003 | 11:04 PM
  #4  
swerve-driver's Avatar
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From: "When the going gets weird, the weird turn pro." -RIPHST
Car: 1991 RS
Engine: 383TBI Fastburns and 2"TB
Transmission: T56 held up by Spohnstuff
Let us know what year/type car you have. Post pictures of the engine. To receive you must give!

Also, I agree with the vortec head suggestion. They make pretty good power for their price.

S-D
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Old Aug 30, 2003 | 11:27 AM
  #5  
matt formula's Avatar
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From: Exton, PA
Car: 1990 firebird formula
Engine: V8 305 TBI
Transmission: TH700R4
I have a 1990 firebird formula 305 tbi, I don't have any pics yet
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Old Aug 30, 2003 | 03:00 PM
  #6  
swerve-driver's Avatar
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From: "When the going gets weird, the weird turn pro." -RIPHST
Car: 1991 RS
Engine: 383TBI Fastburns and 2"TB
Transmission: T56 held up by Spohnstuff
I think (you may want to search to confirm) that the 350 TBI heads may have slightly larger valves in them, so you may see minor gains with that swap (or not). I wouldn't count on much with either the 305 or 350 as both are regrettably lame.
If you are going go through the work of changing heads, I'd consider vortecs.
S-D

Last edited by swerve-driver; Aug 30, 2003 at 03:07 PM.
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