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  351C flexplate help

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Author Topic:   351C flexplate help
Fastback
Journeyman

Posts: 28
From: Livonia,MI
Registered: Dec 2001

posted 05-05-2002 10:03 AM     Click Here to See the Profile for Fastback     Edit/Delete Message   Reply w/Quote

I am looking in a catolog from NPD and they have listed 3 different flexplates for the 351C engine. One is listed for a 72 351C w/C6 . Another is listed for a 71-72 351C-2V or 4v w/c4 or fmx and another is listed as 71 351C-4v exc. CJ, 164 teeth 14.23" O.D. Does anyone know what the difference is. I know different transmissions would require different flex plates but whats the deal with the 164 teeth 14.23" flexplate? I bought a flexplate last year and have had a strange noise ever sense, that I cant seem to find. I did match up the old flexplate with the new one before I installed it. I have pulled the trans and looked at the new flexplate and never saw it rubbing on anything.Im starting to wonder if I over looked something on the new flexplate.

Fastback

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kid vishus
Gearhead

Posts: 3800
From: middle of NC
Registered: Oct 2000

posted 05-05-2002 10:13 AM     Click Here to See the Profile for kid vishus     Edit/Delete Message   Reply w/Quote
I dont know what the diferrence would be. When I switched my cleveland from a C6 to a C4 I used the same flexplate. And it works fine.

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Dave_C
Gearhead

Posts: 646
From: Gadsden, Al
Registered: Aug 99

posted 05-05-2002 04:01 PM     Click Here to See the Profile for Dave_C     Edit/Delete Message   Reply w/Quote
Not sure what they diff would be between the 72 w C6 and 71 164 tooth. They should all be 164 tooth. All the flexplates are slightly dished. The C-6 flexplates put the ring gear and converter mounting surface farther away from the engine and closer to the trans.

The C4/FMX unit is slightly different. The offset is different by about .100". You can use a C-6 flexplate on the large bell C4 as KV did. You can also use a C-4/FMX flexplate on a on a C-6, but you have to put some shims (hardened washers) under the converter mounting pads to keep the converter from being pulled too far out of the trans pump when you tighten it to the flexplate. Been there done that. The C6 flexplate puts the converter farther into the pump due to the increased offset, but as long as it doesn't bottom out it will work fine.

Later,

David Cole

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kid vishus
Gearhead

Posts: 3800
From: middle of NC
Registered: Oct 2000

posted 05-05-2002 05:51 PM     Click Here to See the Profile for kid vishus     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Dave_C:

The C6 flexplate puts the converter farther into the pump due to the increased offset, but as long as it doesn't bottom out it will work fine.

Later,

David Cole


Yep, we do have to make sure we use the factory, umm....the plate between the trans and motor that covers most of the flexplate. I'm sure it has a proper name, but I'm drawing a blank right now. With out it, my convertor was borderline too far into the pump. But with it, its just right.

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Hemikiller
Gearhead

Posts: 261
From: Clinton, CT
Registered: Feb 2002

posted 05-06-2002 12:46 PM     Click Here to See the Profile for Hemikiller     Edit/Delete Message   Reply w/Quote
The 71-73 351 "CJ" motors had a smaller torque converter, @ 10" or so, with a smaller bolt pattern as well. Probably to get the car off the line quicker, as the CJ cam was pretty bad on the low end with the lower compression, especially in the heavier fully optioned Mach 1, XR-7, and Torino/Cyclone. My 70 351C-4V did not appreciate the 4000 lbs of Torino I had saddled it with, backed by a C-6 with a stock converter. I had tried to get the CJ setup, located the converter, but at that time, couldn't locate a flexplate.

In my interchange, they say the 2V and 4V motors use the same flexplate. Most of the Mustang c-4's I've seen use the 157 tooth plate, and the FMX and C-6's use the 164.

KV, I've always called it the "block plate"

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