I have heard that the bolt pattern is the same, however will the flywheel from an externally balanced 390 work on an internally balanced 460?

Is a 390 flywheel neutrally balanced?

 

Much depends on the year of 460 you are working on.

Try these links:

Post #10 is pretty good.
https://www.ford-trucks.com/forums/6...heel-swap.html


Post #7 here is pretty imfornative:
https://www.ford-trucks.com/forums/3...questions.html

Easier to post the link than it is to type the entire explaination.
Do make sure that you have the internal and external balance deal under control.
Any reason why you dont just run a 385 series flywheel? They are not expensive.

 

The 460 is out of a 1975 Lincoln Continental. The reason I am considering the 390 flywheel is convenience - I have two of them and no 460 flywheels. Then engine came with a flex plate.

Thanks for the links

 

Was that flex plate you got with the engine for a 460.
Neil

 

yes, the flex plate was the original 460 part.

I had my cranks mixed up earlier. The 390 was internally balanced so it sounds like it should work on the internally balanced pre-'78 460.

 

yes it will work on the pre78 460

 

There is no such thing as an "externally balanced 390". All 390 engines were internally balanced (AKA a neutrally balanced flywheel).

 

So your putting in a 460 engine where a 390 was, right, & want to use the flexplate thats already on the T/C on the transmission like it sits.
Or, your going to a clutch & straight drive transmission & need the big flywheel.

If your going the straight drive route & not going to use that 460 flexplate & its not busted up in the middle or bend, I know somebody might be interested in the flexplate.
Neil

 

C-Leigh Racing,

I am retaining the original NP 435 so I will have not use for the flex plate. If they are interested I will make sure it is still lying around.

 

Ok, good deal then , any kind of horse trading you be interested in doing.
Neil

 

There could be some parts I'm interested in. I'll send you a PM.