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Any GOOD 8-bolt crank 727 flexplates? #1794919
04/02/15 12:54 PM
04/02/15 12:54 PM
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
B
BradH Offline OP
Taking time off to work on my car
BradH  Offline OP
Taking time off to work on my car
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
The "old reliable"(?) MP SFI 8-bolt flexplate is apparently no longer offered, but I don't recall people complaining about them cracking.

The B&M 8-bolt flexplate doesn't appear to have much meat around the 7/16" converter bolt holes and, IIRC, has been known to crack as result of this.

I saw something about the Reactor brand, but those are aluminum and I'd think would have more potential for bolt-hole elongation issues (an unwarranted concern?).

What are the reliable 8-bolt flexplates available today?

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: BradH] #1794920
04/02/15 12:58 PM
04/02/15 12:58 PM
Joined: Jul 2004
Posts: 468
D
Dyno1 Offline
mopar
Dyno1  Offline
mopar
D

Joined: Jul 2004
Posts: 468
I bought a Mopar SFI one from Mancini.

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: Dyno1] #1794921
04/02/15 01:19 PM
04/02/15 01:19 PM
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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BradH Offline OP
Taking time off to work on my car
BradH  Offline OP
Taking time off to work on my car
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
Quote:

I bought a Mopar SFI one from Mancini.



Interesting... they do show the MP part still, although I'd heard they were no longer available.

Also noticed that CRT appears to sell the PRW version of the B&M round-style plate, only the PRW looks like it might have a little more meat around the bolt holes where the B&Ms are supposed to crack.

Last edited by BradH; 04/02/15 01:25 PM.
Re: Any GOOD 8-bolt crank 727 flexplates? [Re: BradH] #1794922
04/02/15 01:36 PM
04/02/15 01:36 PM
Joined: Feb 2006
Posts: 2,379
MD
Kevins493 Offline
top fuel
Kevins493  Offline
top fuel

Joined: Feb 2006
Posts: 2,379
MD
My car has had an ATI on it since before we owned the car and hasn't had an issue.

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: BradH] #1794923
04/02/15 02:18 PM
04/02/15 02:18 PM
Joined: Jan 2003
Posts: 12,464
Marion, South Carolina [><]
an8sec70cuda Offline
I Live Here
an8sec70cuda  Offline
I Live Here

Joined: Jan 2003
Posts: 12,464
Marion, South Carolina [><]
Never had a problem w/ the B&M 8 bolt plate behind my hemi.


CHIP
'70 hemicuda...8 sec street car
'69 road runner 440 w/ Indy SRs
'69 road runner 440-6, 4 speed...Dad's ride
'71 Demon 340 resto project
'06 GMC 2500HD LBZ Duramax...toy hauler
'16 Grand Caravan SXT...baby hauler
Re: Any GOOD 8-bolt crank 727 flexplates? [Re: BradH] #1794924
04/02/15 03:16 PM
04/02/15 03:16 PM
Joined: Jan 2003
Posts: 1,295
westerly, ri. usa
4
440lebaron Offline
pro stock
440lebaron  Offline
pro stock
4

Joined: Jan 2003
Posts: 1,295
westerly, ri. usa
p5153795 non sfi mopar in stock, p4529752ab sfi backordered, difference is just sfi sticker

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: 440lebaron] #1794925
04/02/15 05:19 PM
04/02/15 05:19 PM
Joined: Aug 2011
Posts: 188
Middletown, Ohio
J
Joes66dart Offline
member
Joes66dart  Offline
member
J

Joined: Aug 2011
Posts: 188
Middletown, Ohio
We have ran the 440 source one for 3 years now and have never had any issues

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: BradH] #1794926
04/02/15 05:30 PM
04/02/15 05:30 PM
Joined: Dec 2006
Posts: 3,667
Arizona
C
Chris'sBarracuda Offline
master
Chris'sBarracuda  Offline
master
C

Joined: Dec 2006
Posts: 3,667
Arizona
Quote:



I saw something about the Reactor brand, but those are aluminum and I'd think would have more potential for bolt-hole elongation issues (an unwarranted concern?).

What are the reliable 8-bolt flexplates available today?







The BEST out there, by far.
Been using them for 25 years.

http://www.reactorproducts.com/

MOPAR
P/N: M-6H (6 Hole)
P/N : M-8H (8 Hole)

Talk to Olan.


Chris..

8479001-Mopar8Front.JPG (91 downloads)
Re: Any GOOD 8-bolt crank 727 flexplates? [Re: BradH] #1794927
04/03/15 07:45 AM
04/03/15 07:45 AM
Joined: Aug 2005
Posts: 294
Staten Island, NY
R
RO23dave Offline
enthusiast
RO23dave  Offline
enthusiast
R

Joined: Aug 2005
Posts: 294
Staten Island, NY
Had a B&M flex plate on my super stock hemi, and had real bad vibration problems, that my teeth felt like they were rattling out, on top end, and, shut down. Finally changed back to the MP SFI flexplate and all vibration problems went away. Gave that B&M flexplate away so i wasnt tempted to try it again. Never had a problem with MP flexplates. Dave ss/ea #1355

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: RO23dave] #1794928
04/03/15 07:57 AM
04/03/15 07:57 AM
Joined: Jul 2010
Posts: 1,845
Tampa
D
DusterDave Offline
top fuel
DusterDave  Offline
top fuel
D

Joined: Jul 2010
Posts: 1,845
Tampa
Quote:

Had a B&M flex plate on my super stock hemi, and had real bad vibration problems, that my teeth felt like they were rattling out, on top end, and, shut down. Finally changed back to the MP SFI flexplate and all vibration problems went away. Gave that B&M flexplate away so i wasnt tempted to try it again. Never had a problem with MP flexplates. Dave ss/ea #1355



Not an 8 bolt, but I have a B&M flexplate behind my smallblock, and my engine builder balanced it.


Gone to the dark side with an LS3 powered '57 Chevy 210
Re: Any GOOD 8-bolt crank 727 flexplates? [Re: DusterDave] #1794929
04/03/15 08:32 AM
04/03/15 08:32 AM
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441 Offline
master
Leon441  Offline
master

Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Never had any issues with the B&M. Used the 6 bolt and 8 bolt version with a lot of power.


Career best 8.02 @ 169 at 3050# and 10" tires small block power.
Re: Any GOOD 8-bolt crank 727 flexplates? [Re: Leon441] #1794930
04/03/15 09:57 AM
04/03/15 09:57 AM
Joined: Sep 2003
Posts: 15,306
north of coder
moparx Offline
"Butt Crack Bob"
moparx  Offline
"Butt Crack Bob"

Joined: Sep 2003
Posts: 15,306
north of coder
is the 8 bolt version[s] available today the same bolt pattern as the early 392 hemis ? if not, what are the differences exactly ?

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: Leon441] #1794931
04/03/15 10:08 AM
04/03/15 10:08 AM
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
B
BradH Offline OP
Taking time off to work on my car
BradH  Offline OP
Taking time off to work on my car
B

Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
Quote:

Never had any issues with the B&M. Used the 6 bolt and 8 bolt version with a lot of power.



No problems with the 6-bolt, but I remembered people posting about the 8-bolt issues and IMO they do look like they need more material around the 7/16" holes.

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: BradH] #1794932
04/04/15 03:27 PM
04/04/15 03:27 PM
Joined: Aug 2003
Posts: 4,599
new jersey usa
1
11secdart Offline
master
11secdart  Offline
master
1

Joined: Aug 2003
Posts: 4,599
new jersey usa
I have a M/P one for sale but puts not SFI


68 Dart 367/904
92 D150 original owner
21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4
20 Acura RDX
16 Honda HRV
Re: Any GOOD 8-bolt crank 727 flexplates? [Re: 11secdart] #1794933
04/04/15 04:05 PM
04/04/15 04:05 PM
Joined: Dec 2007
Posts: 12,507
Great Neck,LI,new york
hemi-itis Offline
I Live Here
hemi-itis  Offline
I Live Here

Joined: Dec 2007
Posts: 12,507
Great Neck,LI,new york
B&m here,no problem,,,,,,,,,,,so far


HEMI-ITIS has no cure.
My condition is fully BLOWN!!
Re: Any GOOD 8-bolt crank 727 flexplates? [Re: hemi-itis] #1794934
04/04/15 04:07 PM
04/04/15 04:07 PM
Joined: May 2005
Posts: 6,446
NJ-USA
H
HPMike Offline
master
HPMike  Offline
master
H

Joined: May 2005
Posts: 6,446
NJ-USA
Have been using the B&M ones for years..Excellent quality..

MB

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: HPMike] #1794935
04/04/15 04:42 PM
04/04/15 04:42 PM
Joined: Jan 2003
Posts: 1,257
Phoenix, AZ
B
Belvedere1 Offline
pro stock
Belvedere1  Offline
pro stock
B

Joined: Jan 2003
Posts: 1,257
Phoenix, AZ
Another B&M positive review, no issues for me.

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: Belvedere1] #1794936
04/04/15 04:49 PM
04/04/15 04:49 PM
Joined: Jun 2003
Posts: 52,955
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,955
Romeo MI
B&M use to make the MP flex plate

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: Chris'sBarracuda] #1798010
04/07/15 10:16 PM
04/07/15 10:16 PM
Joined: Apr 2003
Posts: 3,165
Tulsa, Oklahoma
340Cuda Offline
master
340Cuda  Offline
master

Joined: Apr 2003
Posts: 3,165
Tulsa, Oklahoma
Originally Posted By Chris'sBarracuda
Quote:


I saw something about the Reactor brand, but those are aluminum and I'd think would have more potential for bolt-hole elongation issues (an unwarranted concern?).

What are the reliable 8-bolt flexplates available today?




The BEST out there, by far. <img src="/ubbthreads/images/graemlins/thumbs.gif" alt="" />
Been using them for 25 years.

http://www.reactorproducts.com/

MOPAR
P/N: M-6H (6 Hole)
P/N : M-8H (8 Hole)

Talk to Olan.


Chris.. <img src="/ubbthreads/images/graemlins/tonguue.gif" alt="" />


While Olan seemed like a good guy he never could deliver on a special flex plate he said he could make for me. After he said he could not do it I never could get him to return the new SFI approved flex plate I had sent him for an example. I finally gave up. He was having some health issues at the time, if they have gotten better maybe his service has.
Bill

Re: Any GOOD 8-bolt crank 727 flexplates? [Re: Dyno1] #1798247
04/08/15 01:02 AM
04/08/15 01:02 AM
Joined: Jan 2003
Posts: 698
Southern Maryland
preddy Offline
mopar
preddy  Offline
mopar

Joined: Jan 2003
Posts: 698
Southern Maryland
Originally Posted By Dyno1
I bought a Mopar SFI one from Mancini.


Me too.

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