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weedlayer
Cheesehead Defector


Reged: Jan 19 2003
Loc: CheddarHead till October
case only difference between BB vs SB 727?
      #7893028 - Sat Oct 19 2013 10:06 AM

My new 727 has some bolt holes off. Thinking my builder built a BB instead of a SB. Have not had a chance to check things real close but suspect that is the problem. Easiest fix might be to just change the internals to my other case if I can?

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Fig
member


Reged: Apr 13 2005
Loc: Torrance, Ca
Re: case only difference between BB vs SB 727? [Re: weedlayer]
      #7893032 - Sat Oct 19 2013 10:09 AM

I'm not a 727 expert, but I cant think of one part that is not interchangeable. I lifted this off of another web site if you want to verify big or small block:

It's EASY to tell them apart if they're not attached to an engine. Course, I take for granted you can tell a 727 apart from a 904 from the pan. However, big and small block 727s are simple to distunguish. The small block version only has two torque converter dust cover retaining bolt holes across the bottom of the bell housing. The big block version has four. Of course, the bolt patterns are different, but the dust cover bolt holes are an easy fast way to tell.
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Read more: http://forums.moparmusclemagazine.com/70.../#ixzz2iBMbvBn8

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1937 Plymouth R/S Coupe
440/727

Edited by Fig (Sat Oct 19 2013 10:32 AM)


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dizuster
master


Reged: Jan 12 2005
Loc: Oakland, MI
Re: case only difference between BB vs SB 727? [Re: weedlayer]
      #7893073 - Sat Oct 19 2013 11:10 AM

Only difference is the case. All parts will swap.

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Owner of the ugliest turbo car on the planet. 9.88-137.67mph @3740lbs on 275's


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HPMike
master


Reged: May 11 2005
Loc: NJ-USA
Re: case only difference between BB vs SB 727? [Re: dizuster]
      #7893107 - Sat Oct 19 2013 11:36 AM

Quickest way to tell is the starter position...

If you are looking at the converter opening with the input shaft facing you, the BB has a starter position around 3 o clock...SB is lower...like 4:30 or 5 o clock...


MB


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Polarapete
super stock


Reged: May 08 2003
Loc: Graham, WA
Re: case only difference between BB vs SB 727? [Re: HPMike]
      #7893177 - Sat Oct 19 2013 01:09 PM

Also, the mounting bolts for the struts on the SB case require a large diameter hole at 8 and 4 o'clock

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1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction
1987 D100 cream puff, new daily driver.
2008 Honda Element
2014 Carry-On 7x14 Cargo Trailer


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barracuda7199
member


Reged: Apr 07 2011
Loc: GEORGIA
Re: case only difference between BB vs SB 727? [Re: Polarapete]
      #7893185 - Sat Oct 19 2013 01:15 PM

i always look at the dowel pin holes. small block is straight across from each other. big block the starter side dowel pin hole is higher than the other side.

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Leon441
master


Reged: Nov 24 2004
Loc: Lynchburg, VA
Re: case only difference between BB vs SB 727? [Re: barracuda7199]
      #7893351 - Sat Oct 19 2013 05:43 PM

Quote:

i always look at the dowel pin holes. small block is straight across from each other. big block the starter side dowel pin hole is higher than the other side.




Ya beat me to it. Also you can measure the distance between dowels openings on the case and measure the dowels in the block.

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Career best 8.02 @ 169 at 3050# and 10" tires small block power.


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darted1
member


Reged: Jun 06 2004
Loc: LEWISTOWN PA.
Re: case only difference between BB vs SB 727? [Re: weedlayer]
      #7893762 - Sun Oct 20 2013 06:14 AM

If I remember correctly small block uses a bolt at the top center of bell housing to attach to the motor. the big block doesn't their top bolt holes are at like 11 0clock and 1 oclock so there shouldn't no bolt hole at the top of the big block bell housing.

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ED M


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hemibee69
member


Reged: Jun 17 2004
Loc: SE VA
Re: case only difference between BB vs SB 727? [Re: darted1]
      #7893795 - Sun Oct 20 2013 07:17 AM

That is how I differentiate small to big block bellhousing. If it has a bolt at the top in the center it is a small block. Easy and quick to see.
JiK

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1969 Orig Hemi Super Bee Post 4 spd Red on Red
1971 Orig 440+6 Cuda 4 spd Shaker In Violet
1970 Challenger SE 383 4 bbl A/C PB PS Leather
1970 Cuda Drag car 500" B1 9.10


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weedlayer
Cheesehead Defector


Reged: Jan 19 2003
Loc: CheddarHead till October
Re: case only difference between BB vs SB 727? [Re: hemibee69]
      #7894192 - Sun Oct 20 2013 01:35 PM

it's a BB case. I'll just move everything to my SB case. Thanks for the info.

Guess I should have looked before I drug it under the car and tried to bolt it up.

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Edited by weedlayer (Sun Oct 20 2013 01:37 PM)


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John_Kunkel
I Live Here


Reged: Jan 20 2003
Loc: Rio Linda, CA
Re: case only difference between BB vs SB 727? [Re: hemibee69]
      #7894218 - Sun Oct 20 2013 01:54 PM Attachment (30 downloads)

Quote:

That is how I differentiate small to big block bellhousing. If it has a bolt at the top in the center it is a small block. Easy and quick to see.
JiK




No hole at top center.


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