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#2459853 - 03/02/18 08:48 AM flex plate
RustyM Offline

Registered: 02/24/17
Posts: 341
Loc: Texas
511/727- steel crank/6 bolt.

what sfi flex plate for bracket car.
I see the large round ones but know nothing whatsoever about them.
9 inch converter

any recommendations?


#2459868 - 03/02/18 09:32 AM Re: flex plate [Re: RustyM]
hemi-itis Offline
I Live Here

Registered: 12/29/07
Posts: 10946
Loc: Great Neck,LI,new york
B&M will be fine.
HEMI-ITIS has no cure. My condition is fully BLOWN!!!

New best 60ft,, 1.42,1/8, 6.0 @117,, 9.38 @146.75 with 6 lbs boost @3700 lbs

#2459921 - 03/02/18 11:27 AM Re: flex plate [Re: RustyM]
dvw Offline

Registered: 03/16/06
Posts: 7298
Loc: MI, usa
I run the B&M as well. Aprox 900 hp, no issue.

#2459928 - 03/02/18 11:58 AM Re: flex plate [Re: RustyM]
Cab_Burge Online   content
I Win

Registered: 08/23/03
Posts: 31687
Loc: Bend,OR USA
I use the Mopar brand for SFI, they only offer the one with the H.D. 11 inch bolt pattern with the larger 7/16 inch converter bolts in both 6 bolt 440 and 8 bolt hemi patterns scope up
I've heard to many complaints on the B&M plates not fitting all converters correctly for me to try one down
Maybe it was the converters, maybe not confused shruggy I've never heard anyone complain on the Mopar H.D. not fitting Mopar race converters of any brand work
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

#2459952 - 03/02/18 12:57 PM Re: flex plate [Re: RustyM]
DoubleD Offline
top fuel

Registered: 01/22/03
Posts: 1922
Loc: NE Ohio
The Mopar ones as of late seem to crack after awhile - We had one crack and switched to the B&M - and yes you have to bench fit them first as they are on the tight side when bolting to the converter - I think the real issue is converter mounting lugs can vary just enough to make the difference - on both of the B&M's we use - we had to reem the converter holes a little - no problen since

#2459955 - 03/02/18 01:07 PM Re: flex plate [Re: DoubleD]
DoubleD Offline
top fuel

Registered: 01/22/03
Posts: 1922
Loc: NE Ohio
I found this ATI high HP solution - but I would guess the converter has to be made for it- a dual bolt pattern - our new converteres came with this this dual pattern lug on them allowing for 8 bolts - but we are using the B&M hence the converter has one hole tapped to 7/16 at each lug while the other is 1/2"


Edited by DoubleD (03/02/18 01:48 PM)

#2463065 - 03/08/18 10:22 AM Re: flex plate [Re: RustyM]
an8sec70cuda Offline
I Live Here

Registered: 01/19/03
Posts: 10973
Loc: Marion, South Carolina [><]
B&M on my stuff.
'70 hemicuda...8.91 at 150.5 mph street car...Mopar Action feature Dec. '14
'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 hauler


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