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

tbi heads

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Old Apr 28, 2010 | 09:21 PM
  #1  
bigred75's Avatar
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From: stedman
Car: 1992 25th anniversary RS Camaro
Engine: 305 T.B.I.
Transmission: ????
Axle/Gears: ??????
tbi heads

im getting a 350 tpi engine soon possibly and was wondering if i put the heads off of my lo3 onto the 350 if it would help? i plan on converting the tpi motor to tbi because the wiring harness is all jacked up
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Old Apr 30, 2010 | 12:03 AM
  #2  
DSGx's Avatar
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Car: 92 Pontiac Firebird
Engine: 305 TBI L03
Transmission: 700r4
Axle/Gears: 2.73 one wheel drive
Re: tbi heads

Originally Posted by bigred75
im getting a 350 tpi engine soon possibly and was wondering if i put the heads off of my lo3 onto the 350 if it would help? i plan on converting the tpi motor to tbi because the wiring harness is all jacked up
dude keep the tpi 350 heads, stock l03 heads just suck unless u do some porting etc.
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Old Apr 30, 2010 | 04:25 AM
  #3  
thomas1976's Avatar
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From: West-Central
Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: tbi heads

I would keep the 083 heads too.
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Old Apr 30, 2010 | 08:26 AM
  #4  
bigred75's Avatar
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From: stedman
Car: 1992 25th anniversary RS Camaro
Engine: 305 T.B.I.
Transmission: ????
Axle/Gears: ??????
Re: tbi heads

ok it was just a question cuz some people said the 305 heads would be good. just wondering.
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Old Apr 30, 2010 | 08:16 PM
  #5  
DSGx's Avatar
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Car: 92 Pontiac Firebird
Engine: 305 TBI L03
Transmission: 700r4
Axle/Gears: 2.73 one wheel drive
Re: tbi heads

Originally Posted by bigred75
ok it was just a question cuz some people said the 305 heads would be good. just wondering.
They prolly said that cuz 305 heads have smaller combustion chambers and it would give u bigger comp. ratio .
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Old May 1, 2010 | 04:00 AM
  #6  
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From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Re: tbi heads

TBI heads are very poor when it comes to the airflow department. I think they only flow around 180 CFM. They have a swirl ramp in the intake that helps boost torque. Problem is that its large, and restricts airflow. The heads are essentially useless when it comes to performance applications. They can be made to flow OK, but aren't worth the effort unless your purposefully experimenting.
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