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easy way to tell 727 big from small?? #15753 07/18/05 02:46 PM 07/18/05 02:46 PM
Joined: Jan 2003 Posts: 8,844 poplar bluff mo. T toplescuda OP I Whine
toplescuda OP I Whine T Joined: Jan 2003 Posts: 8,844 poplar bluff mo.	i got a 727 in a deal with a car the 727 was inside the car has no converter what is the most easy way to tell if it for a small block or big block? thanks ralph 1970 barracuda convert. 1 of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline red 2014 quad cab 4x4 ram 8 speed hemi

Re: easy way to tell 727 big from small?? [Re: toplescuda] #15754 07/18/05 02:52 PM 07/18/05 02:52 PM
Joined: Oct 2003 Posts: 7,863 Colorado Leadfoot master
Leadfoot master Joined: Oct 2003 Posts: 7,863 Colorado	The small block has a bolt hole in the top center of the bell housinr and the big block doesn't

Re: easy way to tell 727 big from small?? [Re: Leadfoot] #15755 07/18/05 03:09 PM 07/18/05 03:09 PM
Joined: Jan 2003 Posts: 8,844 poplar bluff mo. T toplescuda OP I Whine
toplescuda OP I Whine T Joined: Jan 2003 Posts: 8,844 poplar bluff mo.	cool deal thanks for the info now i got to go look lol ralph 1970 barracuda convert. 1 of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline red 2014 quad cab 4x4 ram 8 speed hemi

Re: easy way to tell 727 big from small?? [Re: Leadfoot] #15756 07/18/05 03:30 PM 07/18/05 03:30 PM
Joined: Jan 2003 Posts: 25,726 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,726 Rio Linda, CA	Neither bellhousing has a bolt at the top center. The easiest way to tell them apart is the bottom row of 4 bolt holes in the bellhousing, the big block has 4 small holes while the small block has two small and two large holes. 1852679-Bllhsngs.jpg (116 downloads)

Re: easy way to tell 727 big from small?? [Re: John_Kunkel] #15757 07/18/05 05:49 PM 07/18/05 05:49 PM
Joined: Oct 2003 Posts: 7,863 Colorado Leadfoot master
Leadfoot master Joined: Oct 2003 Posts: 7,863 Colorado	My mistake! But now I'm confused.I went and checked a block and there is a hole in the top center. I checked my trans and there is no hole. What gives? 1853029-block.jpg (159 downloads)

Re: easy way to tell 727 big from small?? [Re: Leadfoot] #15758 07/18/05 06:00 PM 07/18/05 06:00 PM
Joined: May 2003 Posts: 96,649 On The Boat, On The Lake, Wa. ... amxautox Still Retired. Still Posting on Moparts. A Lot.
amxautox Still Retired. Still Posting on Moparts. A Lot. Joined: May 2003 Posts: 96,649 On The Boat, On The Lake, Wa. ...	Quote: My mistake! But now I'm confused.I went and checked a block and there is a hole in the top center. I checked my trans and there is no hole. What gives? My 4-spd bell housing has the top center hole. No I can't take a picture, it's in the car and can't get a camera back down there. Maybe if you beg enough I could pull the car out and try. Tom "Everyone should believe in something; I believe I'll go fishing." -Henry David Thoreau Men and fish are alike. They both get into trouble when they open their mouths author unknown

Re: easy way to tell 727 big from small?? [Re: amxautox] #15759 07/18/05 06:18 PM 07/18/05 06:18 PM
Joined: Jan 2003 Posts: 3,136 Palm Coast, FL (near Daytona B... Blown_Hemi master
Blown_Hemi master Joined: Jan 2003 Posts: 3,136 Palm Coast, FL (near Daytona B...	Quote: Quote: My mistake! But now I'm confused.I went and checked a block and there is a hole in the top center. I checked my trans and there is no hole. What gives? My 4-spd bell housing has the top center hole. No I can't take a picture, it's in the car and can't get a camera back down there. Maybe if you beg enough I could pull the car out and try. My cast iron small block truck bell has a hole at the top also. John is correct about the 727 housings. That is how I usually tell the difference. Ask me my opinion of Frank Mitchell....... A Mopar crook!

Re: easy way to tell 727 big from small?? [Re: Blown_Hemi] #15760 07/18/05 06:20 PM 07/18/05 06:20 PM
A Anonymous Unregistered
Anonymous Unregistered A	another easy way to tell- small block starters are below the crank center line , big blocks are inline with the crank centerline. horizontally of course...

Re: easy way to tell 727 big from small?? [Re: Blown_Hemi] #15761 07/18/05 08:14 PM 07/18/05 08:14 PM
Joined: Oct 2003 Posts: 7,863 Colorado Leadfoot master
Leadfoot master Joined: Oct 2003 Posts: 7,863 Colorado	Quote: Quote: Quote: My mistake! But now I'm confused.I went and checked a block and there is a hole in the top center. I checked my trans and there is no hole. What gives? My 4-spd bell housing has the top center hole. No I can't take a picture, it's in the car and can't get a camera back down there. Maybe if you beg enough I could pull the car out and try. My cast iron small block truck bell has a hole at the top also. John is correct about the 727 housings. That is how I usually tell the difference. I guess I just put a bolt wherever there was a hole and never paid much attention.

Re: easy way to tell 727 big from small?? [Re: Leadfoot] #15762 07/18/05 08:50 PM 07/18/05 08:50 PM
A Anonymous Unregistered
Anonymous Unregistered A	I also use starter position to tell the difference. Use the kickdown linkage boss as a refrence point. If I remember right, its above the top starter bolt on the SB and below the top starter bolt on a BB. Its hard to explain but its an easy way to tell them apart.

Re: easy way to tell 727 big from small?? #15763 07/18/05 09:15 PM 07/18/05 09:15 PM
Joined: Jan 2003 Posts: 8,844 poplar bluff mo. T toplescuda OP I Whine
toplescuda OP I Whine T Joined: Jan 2003 Posts: 8,844 poplar bluff mo.	wellm mine dont have a hole in the top so here is what i did i measures the center between the 2 top bolts on a my big block (in car) it is 8 inches(or close enuff) from center of bolt hole to center of bolt hole and the small block is 6 3/4 some tranny have a inch and a half or so on top but those are for motor homes and vans to check the timing through ralph 1970 barracuda convert. 1 of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline red 2014 quad cab 4x4 ram 8 speed hemi

Re: easy way to tell 727 big from small?? [Re: John_Kunkel] #15764 07/18/05 10:06 PM 07/18/05 10:06 PM
Joined: Jun 2004 Posts: 6,780 Alabama Mopar-Al master
Mopar-Al master Joined: Jun 2004 Posts: 6,780 Alabama	Quote: Neither bellhousing has a bolt at the top center. The easiest way to tell them apart is the bottom row of 4 bolt holes in the bellhousing, the big block has 4 small holes while the small block has two small and two large holes. see the tranny on the left? look just under the starter. See the curve? That's the easiest way for me to tell it's a small block. By the curve. And the 2 brace mounts for the block at the bottom of the dust cover helps too.

Re: easy way to tell 727 big from small?? #15765 07/18/05 10:40 PM 07/18/05 10:40 PM
Joined: Aug 2003 Posts: 18,575 Dreaming of the 808 AZ_A12_BEE I Live Here
AZ_A12_BEE I Live Here Joined: Aug 2003 Posts: 18,575 Dreaming of the 808	Quote: another easy way to tell- small block starters are below the crank center line , big blocks are inline with the crank centerline. horizontally of course... I use this method 69.5 A12 Bee, first purchased in 1976, car 169 on registry 69 Coronet R/T 440/4 spd 69 Coronet 500 Conv H code 383 4bbl/auto 37 Plymouth PU Find your spot on earth and ride it.

Re: easy way to tell 727 big from small?? [Re: AZ_A12_BEE] #15766 07/18/05 11:21 PM 07/18/05 11:21 PM
Joined: Jan 2003 Posts: 43,511 Round Lake Beach, Illinoisy Rhinodart Rhinotruck
Rhinodart Rhinotruck Joined: Jan 2003 Posts: 43,511 Round Lake Beach, Illinoisy	I always used the square hole in the top for reference. The small block has about 2" seperating the bolt hole and the square hole while the big block has it about an inch. The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it. JB Rhinehart, Realist A-Body's RULE!

Re: easy way to tell 727 big from small?? [Re: Rhinodart] #15767 07/18/05 11:25 PM 07/18/05 11:25 PM
Joined: May 2003 Posts: 96,649 On The Boat, On The Lake, Wa. ... amxautox Still Retired. Still Posting on Moparts. A Lot.
amxautox Still Retired. Still Posting on Moparts. A Lot. Joined: May 2003 Posts: 96,649 On The Boat, On The Lake, Wa. ...	What square hole? edit; that one sorta next to the bolt hole? [looking at the picture posted above] Never seen or at least paid attention to it before. Last edited by amxautox; 07/18/05 11:27 PM. Tom "Everyone should believe in something; I believe I'll go fishing." -Henry David Thoreau Men and fish are alike. They both get into trouble when they open their mouths author unknown

Re: easy way to tell 727 big from small?? [Re: AZ_A12_BEE] #15768 07/18/05 11:59 PM 07/18/05 11:59 PM
Joined: Jan 2003 Posts: 2,111 Bowie, MD R Reggie top fuel
Reggie top fuel R Joined: Jan 2003 Posts: 2,111 Bowie, MD	Quote: Quote: another easy way to tell- small block starters are below the crank center line , big blocks are inline with the crank centerline. horizontally of course... I use this method Ditto here. Quick and dirty. Use the input shaft centerline as a reference and imagine looking at a clock... BB starter location will be dead on at 3:00 and the SB starter location will be closer to 4:00.

Re: easy way to tell 727 big from small?? [Re: Rhinodart] #15769 07/19/05 11:09 AM 07/19/05 11:09 AM
A Anonymous Unregistered
Anonymous Unregistered A	Quote: I always used the square hole in the top for reference. The small block has about 2" seperating the bolt hole and the square hole while the big block has it about an inch. Easy way for me is if i can fit one finger between the square and round hole it's a big block, two fingers and it's a small block

Re: easy way to tell 727 big from small?? #15770 07/19/05 12:35 PM 07/19/05 12:35 PM
Joined: Jan 2003 Posts: 43,511 Round Lake Beach, Illinoisy Rhinodart Rhinotruck
Rhinodart Rhinotruck Joined: Jan 2003 Posts: 43,511 Round Lake Beach, Illinoisy	Quote: Quote: I always used the square hole in the top for reference. The small block has about 2" seperating the bolt hole and the square hole while the big block has it about an inch. Easy way for me is if i can fit one finger between the square and round hole it's a big block, two fingers and it's a small block Ahh, Two Fingers Tequila, I think I remember it..... The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it. JB Rhinehart, Realist A-Body's RULE!

Re: easy way to tell 727 big from small?? #15771 07/19/05 12:36 PM 07/19/05 12:36 PM
Joined: Jan 2003 Posts: 10,968 Hampton, Ga. 7 70dart360 Green Meister
70dart360 Green Meister 7 Joined: Jan 2003 Posts: 10,968 Hampton, Ga.	What the heck is the square hole there for? I've always wondered about it. Tim 70 Dart Swinger 72 D-100 440 shortbed 76 Pinto, 68k 21mpg!

Re: easy way to tell 727 big from small?? [Re: 70dart360] #15772 07/19/05 01:41 PM 07/19/05 01:41 PM
Joined: May 2003 Posts: 96,649 On The Boat, On The Lake, Wa. ... amxautox Still Retired. Still Posting on Moparts. A Lot.
amxautox Still Retired. Still Posting on Moparts. A Lot. Joined: May 2003 Posts: 96,649 On The Boat, On The Lake, Wa. ...	Ok, the square hole is only on the INSIDE of the bell, it can't be seen from the outside, it doesn't go all the way thru. Somebody might have mentioned that. I just went out to find these elusive holes. As I said earlier I've never even seen a square hole. Whenever I've had a tranny off I've only looked at the seals, ect. Never figured why I'd need to look at the holes. Now I have a reason to look at the holes too. Tom "Everyone should believe in something; I believe I'll go fishing." -Henry David Thoreau Men and fish are alike. They both get into trouble when they open their mouths author unknown

Re: easy way to tell 727 big from small?? [Re: 70dart360] #15773 07/19/05 05:39 PM 07/19/05 05:39 PM
Joined: Jan 2003 Posts: 25,726 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,726 Rio Linda, CA	Quote: What the heck is the square hole there for? I've always wondered about it. I've always wondered too, I suspect it's a tooling hole used to locate the case for machining. The INTERNET, the MISinformation superhighway

Re: easy way to tell 727 big from small?? [Re: John_Kunkel] #15774 07/19/05 06:20 PM 07/19/05 06:20 PM
Joined: Jan 2003 Posts: 10,968 Hampton, Ga. 7 70dart360 Green Meister
70dart360 Green Meister 7 Joined: Jan 2003 Posts: 10,968 Hampton, Ga.	That makes sense John, never thought about it that way. Tim 70 Dart Swinger 72 D-100 440 shortbed 76 Pinto, 68k 21mpg!

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