[Chevelle-list] SBC flexplate

[Leo John Costigan]

SBC engines have the same flange bolt pattern. The difference will be in 
transmission used and whether the crank is internal or external balanced.



With the exception of the SBC 400 engine all are internally balanced that 
have the two piece seal.



Some replacement GM flex plates will have a dual converter bolt pattern for 
the TH 350 & 400 transmissions.  Original, for the factory, will be 
dedicated to a converter & transmission.



Aftermarket venders will supply flexplates with all four converter bolt 
patterns, Powerglide, TH 350, TH 400 & TH 700R4.  Also supplied is a balance 
plate to add for a crank that is externally balanced.



The other difference will be whether the flexplate has 153 or 168 teeth. 
Starter noise will need to match the flexplate.



I don't remember what the diameters of the two flexplates, just the number 
of teeth.



Leo

----- Original Message ----- 
From: "John Nasta" <69ec at johnnasta.com>
To: <Chevelle-list at chevelles.net>
Sent: Monday, November 20, 2006 3:08 PM
Subject: [Chevelle-list] SBC flexplate


> My brother has a brand new GM flexplate that he says I can have for  free. 
> Oddly enough it lists several SBC engines on the box but does  not 
> specifically say 350. It does say 283, 307, and a bunch of other  engine 
> sizes. He says it is the right outside diameter (about 14 1/8"  including 
> the teeth) and has the 2.5" center hole. Sounds correct.  Does anyone know 
> if all the SBCs with two-piece main seal use the same  flexplate?
>
> Thanks,
> John Nasta
>
>
>
>
>
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