Are big & small blocks the same flywheel?

Friend called me & his 440 with steel crank is ready for the dyno. It will be an auto car but shop need a flywheel to hook it to the dyno. Shop says any small block or big block flywheel will work for this.

Now I know that 360's & cast crank flywheels won't work but will a 340 work on a 440?

Thanks!

There are several OEM 6 bolt A motor internally balanced motors, 273,318,340, 130 tooth nuetral balance flywheels that will work on either the BB, 426 Hemi and B and RB internally balanced motors, same on the internally balanced motors with the larger 143 tooth flywheels The key is internally balanced motors using a nuetral balanced flywheel, aluminum, stee, 130 or 143 tooth IHTHs

I don't know if this will help you or not but my internally balanced 408 small block uses the same powerglide flex plate as my big blocks. Lots of used outdated sfi flex plates are bought for this purpose

Soooooo, It will work?

So if he gets any 6 bolt flywheel that is for an internally balanced motor it will work?

In a word, YES! Any 6-bolt internally balanced flywheel will work.

I messed up and forgot to include A motor flywheels on my original post, sorry See the post now with the edit, Rhinodart is correct

That's what that spare 318 sitting in the corner is for.

R.

YEs ASSuMEing the 440 in question is also internal balance ... which the OP never says ...

10.5" - 130 tooth - YES
11" - 143 tooth - YES (they did come on some LA truck motors)
11" - 172 tooth (Hemi 66-67) - NO

What # of teeth does this dyno already use is the BIG question. If 130T, then get a 10.5" and you're good to go.

OK thanks for all of the help! Now I know what to tell him.