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400 SBC Flywheel Question and Others

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Old Jan 31, 2006 | 01:26 PM
  #1  
Virtualdemo's Avatar
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From: La Union, NM
Car: 1986 IROC Z28
Engine: 400 SBC
Transmission: 700R4
Axle/Gears: 3.42 Limited Slip
400 SBC Flywheel Question and Others

I was wondering if all 400s came with a 168 tooth wheel? Also would you guys run a Mini Starter or just stick with a stocker?
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Old Jan 31, 2006 | 01:38 PM
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Car: '89 Firebird
Engine: 7.0L
Transmission: T56
The 400 small block is an externally balanced engine. In other words, the crank, pistons, and rods are not fully balanced in and of themselves. An extra set of weights is added to the flywheel to balance the whole system. You can use a 168 tooth ring gear as long as the weights are designed for your 400 small block. Call the Summit Racing tech line to get a part number.

A mini starter (or gear reduction starting motor) is generally more expensive than a stock starting motor. The only reason you might spend the extra money is if you need a small starting motor because of space limitations. In some cases, a gear reduction starting motor will provide more cranking torque for hard start conditions, such as cold weather. But unless you are having starting motor cranking speed problems, I wouldn't bother spending the extra money on a mini starter.

Keep in mind that a 168 tooth ring gear is smaller in diameter than a standard ring gear for your engine. You will need a special starting motor with the correct offset to make the gear teeth mate properly. You might also need a special mounting pattern on the engine block. Just make sure you have all the details worked out before you buy a ring gear.
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Old Jan 31, 2006 | 01:46 PM
  #3  
Virtualdemo's Avatar
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From: La Union, NM
Car: 1986 IROC Z28
Engine: 400 SBC
Transmission: 700R4
Axle/Gears: 3.42 Limited Slip
Wow! You gave me the whole low down. COOL!

I was asking because I will be swapping in a 400 but the starter is weak on the current vehicle and before I swap I want to have a new starter to install. Just didnt want to get the new one then have it be a 153 tooth.

Ill just buy the stock one then, even though I dont know where the Y pipe may be sittin when I am done....
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Old Jan 31, 2006 | 06:09 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally posted by QwkTrip
Keep in mind that a 168 tooth ring gear is smaller in diameter than a standard ring gear for your engine.


168 tooth = 14" diameter
153 tooth = 12.75" diameter (standard for 3rd gens V8's)
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Old Feb 1, 2006 | 08:10 AM
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Car: '89 Firebird
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You're right, Kid... I got messed up in my head and thought it was the smaller diameter flywheel. Good catch!
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