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

HI comp. 355 v.s. 383?

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Old Sep 12, 2004 | 07:25 PM
  #1  
vic_V8's Avatar
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From: Dixon, IL
Car: RS
Engine: 305
Transmission: 4L60
Axle/Gears: 3.42
HI comp. 355 v.s. 383?

which will yeild more power with the tbi setup?

Specs: Two bolt block, L98 heads, roller conversion

about 10.5:1 compression 355 or a about a 8.5:1 compression 383
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Old Sep 12, 2004 | 07:55 PM
  #2  
Low C1500's Avatar
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From: Red Deer, Canada
Car: 89 Shortbox
Engine: 350 Vortec
Transmission: 700r4
Why not a high comp 383?

This debate has come up lots. 350 and 383 make about the same HP, but 383 makes more tq.

Also with the money saved from the stroker kit, you can get better parts for your 355.
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Old Sep 12, 2004 | 08:32 PM
  #3  
91RedFirebird's Avatar
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From: TX
Car: 91 firebird
Engine: 350
Transmission: t-56
The real Question is how much money do you have and what will you be doing with the car? A killer high compression high rpm 350 will be a dog with 2.73 grears and a stock stall, or a brutal 383 will pop t-5's and 7.5 ring grears at will if your crazy with it all the time. Give some more info.
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Old Sep 12, 2004 | 09:13 PM
  #4  
vic_V8's Avatar
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From: Dixon, IL
Car: RS
Engine: 305
Transmission: 4L60
Axle/Gears: 3.42
car is a A4, 2.73 rear

would change stall and rear gears

the car is going to be totally restored to orginal, (look anyways, for show classes) but I want it to be fun to drive on the way to the shows, or on a sunday drive

I was planning on a 355, but wanted input from others, for or against.
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Old Sep 12, 2004 | 09:41 PM
  #5  
91RedFirebird's Avatar
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From: TX
Car: 91 firebird
Engine: 350
Transmission: t-56
I would go with the 350 and spend my money on heads cam and intake TBI mods other than a 383. Aluminum heads I would go with 10:1 or cast Iron 9.5:1 to keep out of detonation problems.
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