Flywheel
 

Can someone tell me what this flywheel decodes to and what it is dated?

Thanks,

-Dave

http://cgi.ebay.com/ebaymotors/ws/eBayIS...AAQ:MOTORS:1123

Re: Flywheel
 

11" OEM High Performance GM Flywheet Casting # 3973456 N. GM part# 3973456. Nogular Iron, Weight 28.4 LBS. Dated January 6, 1955?, 1965?, 1975? .

Re: Flywheel
 

[ QUOTE ]
11" OEM High Performance GM Flywheet Casting # 3973456 N. GM part# 3973456. Nogular Iron, Weight 28.4 LBS. Dated January 6, 1955?, 1965?, 1975? .

[/ QUOTE ]

Thanks very much John. Can I ask, what book or data base did you use to decode that flywheel?

-Dave

Re: Flywheel
 

It looks like a January,6th,1975 date to me,used on all internally balanced Small Block & Big Blocks.
How many teeth are on it..168?..If so that was superceded by Flywheel #3991469 later on & to be used on ALL 1967-85 internal balanced engines w/11" clutch & 2pc. rear seal.

Re: Flywheel
 

Yes its 168 Tooth.

Re: Flywheel
 

The part number: 3973456 tells you that it probably had to
be from a design, or modification sometime in the 1969
model year.

Nuch

Re: Flywheel
 

[ QUOTE ]

Thanks very much John. Can I ask, what book or data base did you use to decode that flywheel?
-Dave

[/ QUOTE ]

To tell the truth, even though I do have the dealer catalogues to look it up, I just typed into Google~

3973456 flywheel

~and came up with this.

http://forums.corvetteforum.com/show....php?t=1857077

I must be getting smarter, or maybe just lazy. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

Next time I'll do a spell check when I copy information or something from someone else though. https://www.yenko.net/ubbthreads/imag...ins/tongue.gif

Re: Flywheel
 

Wow. I never thought to Google something like that.
Thanks again,

-Dave