What year is my c4 and how many teeth does my flexplate have?

[C0V3R]

I need to get a new 50oz flywheel for my c4 as part of my engine build. I need to identify the c4 I have. It has the following printed on the top of the transmission:

8R12497

Pics:

View attachment 474561
View attachment 474563

 

[D.Hearne]

157 tooth. All you had to do was count the teeth.

 

[C0V3R]

Yeah I was pretty sure that you could determine it from the housing. And I was sure I'd muck up counting the teeth.

Do you know what year it is?

Thanks very much!

 

[brianj5600]

Casting #s are your friend!

 

[C0V3R]

Casting #s are your friend!

Does this mean anything? 8R12497

 

[D.Hearne]

Not the casting numbers, sounds like the serial numbers from the car it was installed in at the factory.

 

[mustangdave]

Casting numbers will start with a letter, ( C for 1960's, D for 1970's, and so on). The next place will be a digit designating the year. So C6 would be 1966, C7 is 1967, and so on.

 

[302 coupe]

I'm surprised you didn't break the bellhousing pulling it with a chain like that. It would have been much easier if you just pulled it out from the bottom.

 

[thehueypilot]

Look on the outside of the front servo cover for a casting date. Mine had a "67" date cast into the cover which would fit the build date of my 1968 Mustang. Its the cover you see in your first photo.