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

Square bore or Spread bore?

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Old Apr 8, 2003 | 11:21 PM
  #1  
25THRSS's Avatar
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From: Glen Allen, VA
Square bore or Spread bore?

Which is better for the 670 tbi and why? What about the stock tbi or does it matter?
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Old Apr 9, 2003 | 12:42 PM
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Z28 Boy's Avatar
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From: Charlotte, NC
Car: 1991 Camaro RS
Engine: GMPP 350 HO w/TBI
Transmission: 700R-4
Axle/Gears: 10-bolt w/3.73s
check my reply in your other post...you should get some answers there.

the spread bore will work with both...the square bore will work with the stock one fine, or the 454/holley one with modifications.

-brian
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Old Apr 9, 2003 | 07:37 PM
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From: Glen Allen, VA
Does one have an advantage over the other on the stock tbi heads? Thanks for the info! I really appreciate it!
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Old Apr 9, 2003 | 07:47 PM
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Z28 Boy's Avatar
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From: Charlotte, NC
Car: 1991 Camaro RS
Engine: GMPP 350 HO w/TBI
Transmission: 700R-4
Axle/Gears: 10-bolt w/3.73s
no.

the square bore intakes are usually for higher performance engines. like, if you look at all of the single plane intakes, etc. they will all have square bore mounting areas.

-brian
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