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C5 Bellhousing Differences
+4
komradekozik
968gene
87-944S
gt1scca
8 posters
Page 1 of 1
C5 Bellhousing Differences
Here we go again...
The Corvette C5 2-piece bellhousing is a hot item these days. It seems there exists another C5 bellhousing that no one is sure about, and at one time it was thought to be an auto-trans bellhousing.
I have a GM #12551118 (1-piece) bellhousing for my LT1 setup. Inside dimensions are larger than the SBC bellhousing, so a 168T flywheel and 11.0" clutch will be accommodated. All the rage has been "The 2-piece design allows removing the lower section for component inspection and proper torque tube alignment"...
News Flash...
These bellhousings have been sold used with CRACKS in them. Are they worth the risk?
The early C5 bellhousing is a 1-piece design, but features a hulking 2" X 4.25" oval inspection hole @ the bottom. The 1-piece design is definitely stronger...Have you ever seen a SBC cast bellhousing crack (unless subjected to enormous shock load)? The removable lower section may be a nice touch, but it isn't worth much on a cracked bellhousing...
On to the big deal...
The GM #12551118 (1-piece C5 BH) will work with up to a 12.0" clutch setup, is stronger than the GM #12554980 (2-piece C5 BH), and is dirt cheap ($35 on eBay today).
Here's the drawings (drawn to scale, exported as jpegs) and pics.
Note that the #12551118 BH will require minor machining for the clutch slave hoses.
[You must be registered and logged in to see this image.]
The Corvette C5 2-piece bellhousing is a hot item these days. It seems there exists another C5 bellhousing that no one is sure about, and at one time it was thought to be an auto-trans bellhousing.
I have a GM #12551118 (1-piece) bellhousing for my LT1 setup. Inside dimensions are larger than the SBC bellhousing, so a 168T flywheel and 11.0" clutch will be accommodated. All the rage has been "The 2-piece design allows removing the lower section for component inspection and proper torque tube alignment"...
News Flash...
These bellhousings have been sold used with CRACKS in them. Are they worth the risk?
The early C5 bellhousing is a 1-piece design, but features a hulking 2" X 4.25" oval inspection hole @ the bottom. The 1-piece design is definitely stronger...Have you ever seen a SBC cast bellhousing crack (unless subjected to enormous shock load)? The removable lower section may be a nice touch, but it isn't worth much on a cracked bellhousing...
On to the big deal...
The GM #12551118 (1-piece C5 BH) will work with up to a 12.0" clutch setup, is stronger than the GM #12554980 (2-piece C5 BH), and is dirt cheap ($35 on eBay today).
Here's the drawings (drawn to scale, exported as jpegs) and pics.
Note that the #12551118 BH will require minor machining for the clutch slave hoses.
[You must be registered and logged in to see this image.]
gt1scca- Posts : 795
Join date : 2009-06-08
Age : 55
Location : Belton, SC
Re: C5 Bellhousing Differences
A few shots of the hydraulic line reliefs in the 12554980.
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This should look familiar to some of you...
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This should look familiar to some of you...
[You must be registered and logged in to see this image.]
gt1scca- Posts : 795
Join date : 2009-06-08
Age : 55
Location : Belton, SC
Re: C5 Bellhousing Differences
Greg,
You never cease to amaze me with the information and detailed drawings you supply! Do you ever sleep? I'm feeling a bit inadequate in the bellhousing area now.
Mike
You never cease to amaze me with the information and detailed drawings you supply! Do you ever sleep? I'm feeling a bit inadequate in the bellhousing area now.
Mike
87-944S- Posts : 744
Join date : 2009-06-10
Location : Maryland
Re: C5 Bellhousing Differences
Thanks Mike...87-944S wrote:Greg,
...Do you ever sleep? I'm feeling a bit inadequate in the bellhousing area now.
Mike
SLEEP?...Wa' Dat?
The first 3 months of Kyle-dom broke me from that!
Don't get too worked over about the bellhousing...
"A solid two-piece is a far better show than a one-piece...
especially if it's put together right..."
gt1scca- Posts : 795
Join date : 2009-06-08
Age : 55
Location : Belton, SC
BH Q:
Are the manual BH and the Auto different? The auto looks a great deal like the early one piece you posted (12551118).
968gene- Posts : 259
Join date : 2009-07-02
Re: C5 Bellhousing Differences
Slightly...
My drawings are done to scale for comparison. As mentioned, the "Auto" bellhousing will contain a 12" (11.75" disc diameter) clutch assembly. From what I've seen, they are cheap, but lack the benefit of the 2-piece design.
The main benefit of the 12554980 (Manual) BH is only for inspection...
You can't remove or replace anything with it in place. The cast-in oval hole on the Auto BH (12551118) is for torque coupler access on the Corvette, but should serve as an adequate inspection hole for 944 V8 applications.
A bargain is a bargain:
This one comes with added strength.
My drawings are done to scale for comparison. As mentioned, the "Auto" bellhousing will contain a 12" (11.75" disc diameter) clutch assembly. From what I've seen, they are cheap, but lack the benefit of the 2-piece design.
The main benefit of the 12554980 (Manual) BH is only for inspection...
You can't remove or replace anything with it in place. The cast-in oval hole on the Auto BH (12551118) is for torque coupler access on the Corvette, but should serve as an adequate inspection hole for 944 V8 applications.
A bargain is a bargain:
This one comes with added strength.
gt1scca- Posts : 795
Join date : 2009-06-08
Age : 55
Location : Belton, SC
what am I missing?
It looks like the two drawings are labeled incorrectly. The shape of the one piece design is labeled two piece and the two piece, one piece. I'm thinking about going this way too. Anyone want to buy my two piece C5 BH? (complete with inspection cover bolts)
968gene- Posts : 259
Join date : 2009-07-02
Re: C5 Bellhousing Differences
The drawings are (partial) cross-sections.
2-piece design is more of a "bell" shape than the 1-piece, but the inside dimensions are roughly the same where the pressure plate resides.
2-piece design is more of a "bell" shape than the 1-piece, but the inside dimensions are roughly the same where the pressure plate resides.
gt1scca- Posts : 795
Join date : 2009-06-08
Age : 55
Location : Belton, SC
Re: C5 Bellhousing Differences
Post it in the For Sale section, and kiss it Bye Bye.968gene wrote:Anyone want to buy my two piece C5 BH? (complete with inspection cover bolts)
I get emails constantly looking for a line on a bellhousing...
WTB posts are popping up on CorvetteForums also.
gt1scca- Posts : 795
Join date : 2009-06-08
Age : 55
Location : Belton, SC
c5 bellhousing
Will a corvette c5 bellhousing bolt onto a 5.3 Vortec Block?
komradekozik- Posts : 5
Join date : 2009-12-26
C5 Bellhousing and Adapter
komradekozik wrote:Will a corvette c5 bellhousing bolt onto a 5.3 Vortec Block?
All day long.....
968gene- Posts : 259
Join date : 2009-07-02
Re: C5 Bellhousing Differences
oh alright thats good to know, would you say that a 5.3 truck engine be a decent alternative to an f-body ls1? considering that the intake and accessories need changed?
komradekozik- Posts : 5
Join date : 2009-12-26
5.3 vs. LS1
5.3 = much less expensive ($500?), most LSx parts are a bolt on so you can source parts inexpensively (LS1 intake is $50, TB $50, Truck ECU $75, etc.) If you are lucky, you can find an L33 or other aluminum 5.3 for cheap too. Can make 400+ HP easy.
LS1 = more expensive, (if cheap probably abused).
LS2, LS6, LS7 = more $$$.
Buy everything at once. Get the engine, harness, ECU (PCM), etc. etc.
LS1 = more expensive, (if cheap probably abused).
LS2, LS6, LS7 = more $$$.
Buy everything at once. Get the engine, harness, ECU (PCM), etc. etc.
968gene- Posts : 259
Join date : 2009-07-02
Re: C5 Bellhousing Differences
will the 5.3 harness plug into the LS1 stuff?
komradekozik- Posts : 5
Join date : 2009-12-26
Re: C5 Bellhousing Differences
To get back on topic...
Here's what I have learned with the 12551118 BH:
To use this bellhousing on a SBC / LT1 engine, a high-torque stater (SUM-820323-M) must be used. I bolted my 12551118 BH up to the '96 LT1, and the stock starter is now scrap. The stock GM starter nose-cone will not clear the bell, and the HT starter does not utilize the nose-cone.
The same starter problem will likely exist on the LS engine, but it is being verified.
For the 12554980 (2-piece) BH, starter design and location is not an issue.
[You must be registered and logged in to see this image.]
Here's what I have learned with the 12551118 BH:
To use this bellhousing on a SBC / LT1 engine, a high-torque stater (SUM-820323-M) must be used. I bolted my 12551118 BH up to the '96 LT1, and the stock starter is now scrap. The stock GM starter nose-cone will not clear the bell, and the HT starter does not utilize the nose-cone.
The same starter problem will likely exist on the LS engine, but it is being verified.
For the 12554980 (2-piece) BH, starter design and location is not an issue.
[You must be registered and logged in to see this image.]
gt1scca- Posts : 795
Join date : 2009-06-08
Age : 55
Location : Belton, SC
Re: C5 Bellhousing Differences
Confirmed, and here's the fact, Jack...gt1scca wrote:The same starter problem will likely exist on the LS engine, but it is being verified.
The MSD starter will work.
MSD #5096
[You must be registered and logged in to see this image.]
MSD #5095 (For the SBC / LT1)
[You must be registered and logged in to see this image.]
Other gear reduction starters will give similar results. The MSD starters were listed because of the P/N used for test fitting. No affiliation, of course...
(Thanks Mike!)
gt1scca- Posts : 795
Join date : 2009-06-08
Age : 55
Location : Belton, SC
Re: C5 Bellhousing Differences
gt1scca wrote:Slightly...
My drawings are done to scale for comparison. As mentioned, the "Auto" bellhousing will contain a 12" (11.75" disc diameter) clutch assembly. From what I've seen, they are cheap, but lack the benefit of the 2-piece design.
The main benefit of the 12554980 (Manual) BH is only for inspection...
You can't remove or replace anything with it in place. The cast-in oval hole on the Auto BH (12551118) is for torque coupler access on the Corvette, but should serve as an adequate inspection hole for 944 V8 applications.
A bargain is a bargain:
This one comes with added strength.
Old thread, I know... But have a question regarding the auto bell housings. I'm beginning my conversion, and looking for a BH. While looking at autotragic bell housings on ebay, I noticed they don't have the relief cuts for the slave cylinder hydraulic lines.
Is there anything else different? Is there enough material in that area to machine two slots for the hydraulic lines?
UltimatE- Posts : 3
Join date : 2010-05-24
Re: C5 Bellhousing Differences
You can notch it. The problem with the 1-piece Auto C5 bellhousing is you can only fit a 10.5" clutch.
xschop- Posts : 2711
Join date : 2009-06-09
Location : OKC
Re: C5 Bellhousing Differences
Sorry to bump an old thread, but a 10.5" clutch is max? The OP was able to fit a 12" flywheel, but maybe that is only for the SBC/LT1?
As far as starters, an OEM C5 starter should work just fine. No difference in part numbers between the auto and manual on Rockauto. GM loves to reuse parts between platforms.
As far as starters, an OEM C5 starter should work just fine. No difference in part numbers between the auto and manual on Rockauto. GM loves to reuse parts between platforms.
superman22x- Posts : 272
Join date : 2015-01-29
Re: C5 Bellhousing Differences
gt1scca wrote:Here we go again...
The Corvette C5 2-piece bellhousing is a hot item these days. It seems there exists another C5 bellhousing that no one is sure about, and at one time it was thought to be an auto-trans bellhousing.
I have a GM #12551118 (1-piece) bellhousing for my LT1 setup. Inside dimensions are larger than the SBC bellhousing, so a 168T flywheel and 11.0" clutch will be accommodated. All the rage has been "The 2-piece design allows removing the lower section for component inspection and proper torque tube alignment"...
News Flash...
These bellhousings have been sold used with CRACKS in them. Are they worth the risk?
The early C5 bellhousing is a 1-piece design, but features a hulking 2" X 4.25" oval inspection hole @ the bottom. The 1-piece design is definitely stronger...Have you ever seen a SBC cast bellhousing crack (unless subjected to enormous shock load)? The removable lower section may be a nice touch, but it isn't worth much on a cracked bellhousing...
On to the big deal...
The GM #12551118 (1-piece C5 BH) will work with up to a 12.0" clutch setup, is stronger than the GM #12554980 (2-piece C5 BH), and is dirt cheap ($35 on eBay today).
Here's the drawings (drawn to scale, exported as jpegs) and pics.
Note that the #12551118 BH will require minor machining for the clutch slave hoses.
[You must be registered and logged in to see this image.]
Can you make your own oil pan instead of buying the one that's $500
Christopher Moffett- Posts : 11
Join date : 2017-03-04
Re: C5 Bellhousing Differences
gt1scca wrote:Here we go again...
The Corvette C5 2-piece bellhousing is a hot item these days. It seems there exists another C5 bellhousing that no one is sure about, and at one time it was thought to be an auto-trans bellhousing.
I have a GM #12551118 (1-piece) bellhousing for my LT1 setup. Inside dimensions are larger than the SBC bellhousing, so a 168T flywheel and 11.0" clutch will be accommodated. All the rage has been "The 2-piece design allows removing the lower section for component inspection and proper torque tube alignment"...
News Flash...
These bellhousings have been sold used with CRACKS in them. Are they worth the risk?
The early C5 bellhousing is a 1-piece design, but features a hulking 2" X 4.25" oval inspection hole @ the bottom. The 1-piece design is definitely stronger...Have you ever seen a SBC cast bellhousing crack (unless subjected to enormous shock load)? The removable lower section may be a nice touch, but it isn't worth much on a cracked bellhousing...
On to the big deal...
The GM #12551118 (1-piece C5 BH) will work with up to a 12.0" clutch setup, is stronger than the GM #12554980 (2-piece C5 BH), and is dirt cheap ($35 on eBay today).
Here's the drawings (drawn to scale, exported as jpegs) and pics.
Note that the #12551118 BH will require minor machining for the clutch slave hoses.
[You must be registered and logged in to see this image.]
Would an au5omatic c5 bellhousing work
Christopher Moffett- Posts : 11
Join date : 2017-03-04
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