Cracks in flywheel

[basement]

I took the flywheel from my 318 4-speed to have it resurfaced and the guy said its been done before and he would not be able to remove the stress cracks anyways. First, what kind of cracks are exceptable, these appear to go deeper then just the surface? Second, will a 318 flywheel fit a 360? Thirdly, I've been checking pricing of new flywheels and I'm confused about externally and internally balanced cranks and not sure what kind I'm supposed to order if that is the route I take?

[purple1]

The 273-318-340 are internally balanced cranks. 360 is an externally balanced crank. It will bolt up, but the balance will be off. The 360 flywheel or converter for autos is really off-set balanced to make the assembly balanced. Along with the harmonic balancer on the front of the crank.

Dave 

[bb71challenger]

Aren't the post 71 and 340 cast crank engines externally balanced also?

[basement]

Is there a visual way to tell the difference between a 318 and 360 flywheel?

[purple1]

Aren't the post 71 and 340 cast crank engines externally balanced also?

Maybe? I'm not sure? 

But the 318 flywheel will not work with a 360. 

Is there a visual way to tell the difference between a 318 and 360 flywheel?

Sorry. Not sure of that one either.  It's been some time since I messed with small blocks.

Dave 

[Chryco Psycho]

the 318 & 360 use the same flywheel Casting But the 360 will have 3 large holes in the back of the flywheel for balancing , the cast crank 340 was balanced also but different weight to the 360 flywheel
 all small blocks had the 130 tooth flywheel , 440 Source has new SFI spec 130 tooth flywheels for $130 but you woul dstill need ot have the balance corrected to make it work

[basement]

Thanks everyone, what about the cracks. Like all of us I'm on a tight budget and would like to use my present flywheel, but not if it means botching up the job. What kind of cracks are OK?

[basement]

But the 360 will have 3 large holes in the back of the flywheel for balancing ,

Chryco, are the holes at about 4-Oclock the ones you talk about for a 360?


What do you think of these cracks, still usable?

[bb71challenger]

    I would drop that thing in the trash and never look back.

[HP2]

Yup, I'd ditch it.

When comparing the cost of a flywheel against physical therapy and an artificial prothesis, I'd go for the new flywheel. Or you could spring a few hundred for an SFI certified scattershield to contain it if it came apart.

[moper]

If this was a resto being driven on and off a trailer, I'd use that. But it shouldnt be used for any performance type stuff. It's too far gone. And no, the holes CP is talking about are much larger diameter. I can get a pic of a 360 flywheel this weekend if you need it. But they can be bought new from MP too.

[tactransman]

 

[basement]

Thanks for the drawing Tactransman.
I rec. my new flywheel today and it looks like drawing with the three large holes. My question now is what kind of flywheel did I pull out of my car, because as you see it doesn't look too much like the drawing?

[Aussie Challenger]

MOPAR Performance sell a weight kit for the 360 to attach to standard flywheels for around $29, it comes with instructions of where to fit. There is supposed to be a kit for the 340 externally balanced as well.

[HP2]

The weight kit is for torque convertors and includes all the weights, layout, and instructions for all externally balanced mopar engines, 340, 360, and 440. I forget the part number, but it is available at all Dodge dealers.