flywheels on 86-up SBC

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John S. Gwynne wrote:
> 
> I removed the flexplate on my 88 5.0L TPI SBC to install a flywheel
> and discovered that it had and extra weight to "unbalance" it. This is the
> first SBC that I have with the newer one piece rear main seal. Is it true
> that I need an externally balanced flywheel? Would it be different from
> a 400 small block?
>                                        John S Gwynne
>                                           Gwynne.1 at osu.edu
> _______________________________________________________________________________
>                T h e   O h i o - S t a t e   U n i v e r s i t y
>     ElectroScience Laboratory, 1320 Kinnear Road, Columbus, Ohio 43212, USA
>                 Telephone: (614) 292-7981 * Fax: (614) 292-7297
> -------------------------------------------------------------------------------
John, I had the same flywheel experience w/my '87 TBI 350 Blazer. I
removed the 700R4 
in favor of the NVG4500HD (MT8), and purchased a new flywheel from GM
dealer. I
couldn't find a used one, and couldn't find a good answer to the
usability of a 400
flywheel. This engine is externally balanced. The GM flywheel I am using
is GM P/N 10105832, $192 full retail, $144 net.    steve