what flywheel to use

hi huys, i need some help i have a 1977 302 i'm putting in a 1975 four door maverick that has the original I-6 tranny c-4 3 speed that i'm gonna bolt to and i need to know the diameter of the fly wheel. i don't remember what size tranny i jerked out of there,its been a year since i took it out and it didn't say on the top of it as i remember. thanks ahead of time

 

Most likely a 157 tooth flexplate/flywheel. The imbalance factor depends on what year 302 you're using.

 

it is a 1977 302 i edited it just now thanks isthat the right one to use?

 

Was it a automatic trans? If so , it was a C-4 3 speed.

 

yep, crap! lol things that are in my head i just think people know. c-4 three speed thanks

 

Was the original engine a 250? If not, the trans won't fit the 302.

 

The 200 C4 trans could be used, just not the bell and maybe torque converter...

 

Let me re-phrase that. If it wasn't a 250 then the trans will not bolt up to the 302 wuthout modifications. If it was a 250 the whole thing including flywheel and torque converter will bolt right up to the 302.

 

yep its a 250 isw the 157 tooth flywheel right then?

 

That depends on the imbalance factor of the 250 flexplate. I know the 300's used a neutral balance flexplate, not sure about the 250's. A 77 302 needs a 28 oz/in flexplate.

 

I'm pretty sure all the 250's are 28 oz imb. It should all bolt up to the 302 and work correctly.

 

i'm not using the 250 flywheel.i looked up the engine code using a thread in here and it was a 250. i bought a 157 tooth new flywheel for it.hopefully thats the one i need.

 

If you bought a flywheel, then you're in for a big surprise as a flywheel is used with a manual transmission only. You need a flexplate for an automatic transmission.

 

Ok if it onset work you can use the 250 flywheel or send it back and get your money.

 

According to fordsix.com, the 250 and 302 have different imbalance.

http://www.fordsix.com/250swap.php

IIRC, the 250 has a zero imbalance.