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BB Vs. SB Bellhousing

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Old Apr 21, 2007 | 10:16 PM
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Default BB Vs. SB Bellhousing

Just a quick question are the BB and SB bellhousings the same?
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Old Apr 21, 2007 | 10:18 PM
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i'm guessing yes since i know that the pattern is the same.
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Old Apr 21, 2007 | 10:19 PM
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Bolt patterns are the same. Some bells can only fit the smaller 10.5" clutch assembly though.
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Old Apr 21, 2007 | 10:23 PM
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The bolt pattern where they bolt to the block is the same?
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Old Apr 21, 2007 | 10:25 PM
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Yes, if you remember, you can fit a THM400 behind either block.
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Old Apr 21, 2007 | 10:39 PM
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Originally Posted by Eddie 70
The bolt pattern where they bolt to the block is the same?
YES! Eddie you want the housing for the 11 inch clutch, last 3 numbers are "621" on the part. Getting harder to come by and getting more expensive. I bought one for $60 in '02 fo my 72. Now they are going for $200 plus. Better off with an aftermarket scatter shield ...like a Lakewood.
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Old Apr 21, 2007 | 10:40 PM
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This is the reason I ask. I want to put one of these on my vette when I drop my LS1 in my vette. I need a bracket to mount my Z-bar to and this seems like a good alternative to not having the fabrication facilities at my house to make something.
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Old Apr 21, 2007 | 10:43 PM
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Originally Posted by mbeeman350
YES! Eddie you want the housing for the 11 inch clutch, last 3 numbers are "621" on the part. Getting harder to come by and getting more expensive. I bought one for $60 in '02 fo my 72. Now they are going for $200 plus. Better off with an aftermarket scatter shield ...like a Lakewood.
Keisler sells repros for $225. They're actually better than the 621, they're made thicker.
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Old Apr 22, 2007 | 07:32 AM
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I used one out a a one ton truck. It fit my 14 inch flywheel. The normal small block bellhousing won't clear that big a flywheel.
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Old Apr 22, 2007 | 01:27 PM
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They made a sb bell for 10.5" clutch and 11". The 11" bell ends with the numbers "621" as pointed out. We do carry a repro of the 621.

Richard
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Old Apr 24, 2007 | 09:38 AM
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Originally Posted by norvalwilhelm
I used one out a a one ton truck. It fit my 14 inch flywheel. The normal small block bellhousing won't clear that big a flywheel.
Plannin on the SB to 454 swap shortly.
Where on the bellhousing would a guy look for those #s??
Or is it possible to find them with the motor & bell still in the car?
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Old Apr 24, 2007 | 04:47 PM
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The bellhousing wasn't changed with my conversion...my Vette was originally a 270hp base 4-speed....although I suppose it's possible that a previous owner changed the bellhousing.....totally unconclusive, I know

Also I thought the SB flywheel was 14 inch, only the tooth pattern changed....168 BB vs 153 SB ?

Hey Eddie, what motor are you going to install ?
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Old Apr 24, 2007 | 07:30 PM
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Originally Posted by standup
The bellhousing wasn't changed with my conversion...my Vette was originally a 270hp base 4-speed....although I suppose it's possible that a previous owner changed the bellhousing.....totally unconclusive, I know

Also I thought the SB flywheel was 14 inch, only the tooth pattern changed....168 BB vs 153 SB ?

Hey Eddie, what motor are you going to install ?
BB or SB can use either size bellhousing as both engines have the same pattern on the back of the block. You can use the big one (621) with an 11" clutch and big 168 tooth flywheel/clutch/starter or the smaller one (403) with the small 153 tooth flywheel/10.5" clutch/starter. Most BB's originaly used the large setup but some exceptions used the small setup. Many 350's originaly used the larger setup and some used the smaller setup. All 327's used the small setup from the factory but will accept the bigger setup if desired.

Keep in mind that this can get complicated if you try to swap the small setup for a large setup or vice versa. You can not mix and match the clutch-flywheel-bellhousing-starter setups. They must be used as a set.

There are some oddball factory and aftermarket parts out there that you could find to build a big bellhousing, big flywheel, small clutch, big starter setups but what a pain.

simple, right?

-Mark.
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Old Apr 24, 2007 | 08:14 PM
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Originally Posted by standup
The bellhousing wasn't changed with my conversion...my Vette was originally a 270hp base 4-speed....although I suppose it's possible that a previous owner changed the bellhousing.....totally unconclusive, I know

Also I thought the SB flywheel was 14 inch, only the tooth pattern changed....168 BB vs 153 SB ?

Hey Eddie, what motor are you going to install ?
I am putting in an LS1 out of a 2002 Camaro SS. I was wondering about using the existing bellhousing and if I could use the clutch pivot ball bracket from Scoggins Dickey for the Gen V or VI BB. I was wondering if the pivot would just bolt up to the small block bellhousing.


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Old Apr 24, 2007 | 09:48 PM
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Originally Posted by Eddie 70
I am putting in an LS1 out of a 2002 Camaro SS. I was wondering about using the existing bellhousing and if I could use the clutch pivot ball bracket from Scoggins Dickey for the Gen V or VI BB. I was wondering if the pivot would just bolt up to the small block bellhousing.


The problem is that different chassis use different pivot points. I think you will want the pivot to be in the stock Vette location. The bellhousing is not the correct place for the pivot on a Vette. The Vette pivot boss is located in one of the engine block pivot bosses. That is why SCP sells the bracket. The newer blocks are missing the old style pivot boss.

-Mark.
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Old Apr 25, 2007 | 09:44 AM
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Hey Ed

We have a complete set up for the LS motor. Bell 168 tooth flywheel, clutch and all the bolts needed. Not to mention a complete hydrualic assembly the was designed around you car. It bolts in directly where the pedal push rod comes through.

Just food for thought.

Gene
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Old Apr 26, 2007 | 02:33 AM
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Originally Posted by Eddie 70
I am putting in an LS1 out of a 2002 Camaro SS. I was wondering about using the existing bellhousing and if I could use the clutch pivot ball bracket from Scoggins Dickey for the Gen V or VI BB. I was wondering if the pivot would just bolt up to the small block bellhousing......
Regardless of the size of the motor or bellhousing, in theory, the bracket should work because the bolt pattern is the same and the position of the bellhousing is the same (for both BB/SB and 621/403).....so bolting the bracket on would put the location of the pivot ball exactly where it needs to be.....

I say "in theory" because I don't want to be responsible for the swearing if it doesn't work

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