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

building hp

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Old Sep 1, 2005 | 12:11 PM
  #1  
gscz28's Avatar
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From: Kalamazoo
Car: 89 iroc
Engine: 355 TPI FINALLY
Transmission: 700r4/ SHIFT KIT
Axle/Gears: 3.42
building hp

alright i'm finally looking at building a stroker, question
is it really imparitive to have a 4 bolt main to make 400hp?

or will a 2 bolt do the job?
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Old Sep 1, 2005 | 03:12 PM
  #2  
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
2 bolt will be fine to 500HP more if you do studs. It all kinda depends on how fast you wanna spin it.
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Old Sep 1, 2005 | 03:22 PM
  #3  
ShiftyCapone's Avatar
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
The 2 bolt vs 4 bolt debate will always be present. I would try a few searches to help get a better feel for the necessity of each. A 2 bolt main can support a lot of power.
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Old Sep 1, 2005 | 06:33 PM
  #4  
gscz28's Avatar
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From: Kalamazoo
Car: 89 iroc
Engine: 355 TPI FINALLY
Transmission: 700r4/ SHIFT KIT
Axle/Gears: 3.42
thanks guy's thats kinda what I though and 2 bolts are lot more available and cheaper......thanks again....someone is always here for us
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Old Sep 3, 2005 | 10:39 PM
  #5  
ls2twntur1200hp's Avatar
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Joined: Sep 2005
Posts: 76
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From: Shreveport, Louisiana
Car: 1988 Firebird Formula
Engine: 5.2 tpi
Transmission: th700r4- TCI
Axle/Gears: fourth gen rear 3.42
400 hp is the limit for a stock two bolt main and i say this from experince. Under heavy load like dragracing it puts to much stress on the cap right around the bolt. I would go with a splayed main cap so you could still use your two bolt block. Just take the block down to your local machine shop and have them drill the holes. 550hp is usaully the limit for a unreinforced block. You will need liftervally reinforcements to run any higher. I have both broke a main cap and cracked the block through the side of the lifter vally so i am telling you this from experince.
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