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What flex plate to use? #972737 04/13/11 06:01 PM 04/13/11 06:01 PM
Joined: Dec 2004 Posts: 20 M moparman374 OP member
moparman374 OP member M Joined: Dec 2004 Posts: 20	I have a 1973 340 with a cast crankshaft that is externally balanced and I have a neutral balanced torque converter. I have been told that B&M and TCI sell flexplates to use an externally balanced engine with a neutral balanced torque converter. The bolt pattern on the torque converter I have is 10" diagonally. Does anyone know what part numbers do I need? Note: I also know that cast crank 340s and 360s were balanced differently although they were both externally balanced. As a result the torque converters are not interchangable, nor are the "adapter" flexplates. Any help is appreciated Thanks a Lot!

Re: What flex plate to use? [Re: moparman374] #972738 04/13/11 06:06 PM 04/13/11 06:06 PM
Joined: Jan 2003 Posts: 74,947 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,947 U.S.S.A.	This was just talked about recently , but I can't remember what engine , it was a smallblock though . If the B+M flex plate is still available it has all the needed patterns on it .

Re: What flex plate to use? [Re: JohnRR] #972739 04/13/11 06:51 PM 04/13/11 06:51 PM
Joined: Sep 2005 Posts: 12,481 Chino Valley RodStRace I Live Here
RodStRace I Live Here Joined: Sep 2005 Posts: 12,481 Chino Valley	Just bought a 360 one from Mancini at MATS. They should be able to set you up no problem! It's in the back of the truck if you really need a part number, but I'd call and ask.

Re: What flex plate to use? [Re: moparman374] #972740 04/13/11 07:21 PM 04/13/11 07:21 PM
Joined: Aug 2005 Posts: 989 WI, USA 6 67dodge67 mopar addict
67dodge67 mopar addict 6 Joined: Aug 2005 Posts: 989 WI, USA	Quote: I have a 1973 340 with a cast crankshaft that is externally balanced and I have a neutral balanced torque converter. I have been told that B&M and TCI sell flexplates to use an externally balanced engine with a neutral balanced torque converter. The bolt pattern on the torque converter I have is 10" diagonally. Does anyone know what part numbers do I need? Note: I also know that cast crank 340s and 360s were balanced differently although they were both externally balanced. As a result the torque converters are not interchangable, nor are the "adapter" flexplates. Any help is appreciated Thanks a Lot! Contact John Cope at Cope Racing Trans and talk to him. He set me up without any issues at all. He's a member on here as well.... his work and knowledge is recommended on here many times over. Dave

Re: What flex plate to use? [Re: 67dodge67] #972741 04/13/11 08:18 PM 04/13/11 08:18 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	http://www.summitracing.com/parts/BMM-10235/ this is the flexplate for an external balanced 73 340 with a 727....... a neutral balanced converter can be used with any externally balanced engine as long as the CORRECT flexplate is used.... and yes...the 340 and 360 are externally balanced differently...the 340 required more weight on the converter or flexplate Last edited by 70AARcuda; 04/13/11 08:21 PM. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

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