What flex plate do I need here guys?

[wigsplitter74]

I've got an internally balanced 340 with an aftermarket 8 bolt crank and a converter with the larger "hemi" bolt size. I believe the bolts are on a 10" bolt circle but I can't remember for sure (it's a 10" coan# 40312) So would the B&M flexplate work? here I copied it. IDK what the small bolt circle is or if I have it

SFI Flexplate - Chrysler

Application:
Chrysler '62 & later internally balanced 8-bolt crank - A-727, A-904 (Small bolt circle only 10")

Item# 10231

 

[70aarcuda]

if you have a 8 bolt crank that is the one...make sure all 8 bolts are threaded....

the 8 bolt cranks will take a 1/2 thread bolt to the crank flange.

 

[wigsplitter74]

sweet, good advice too I'll make sure I check that out before I purchase one. Thanks much. another piece of the puzzle 8)

 

[70aarcuda]

because if it an OEM cranks...it is only 6 bolts...

 

[wigsplitter74]

because if it an OEM cranks...it is only 6 bolts...

Right, but I know that the stock crank is long gone and it's got some crazy billet crank with the 8 bolt flange, just had her polished up so it's perty lol

 

[70aarcuda]

ok....i just sold a billet with a 8 bolt cranks and flex plate a couple of weeks ago....