My understanding is that an automatic tranny has a flexplate and a manual tranny has a flywheel. With that aside, would there be any benefits to a lightweight flexplate? What about any disadvantages? Could someone please esplain why a lightweight vs. heavy or stock flexplate would be better or worse? By the way, this is for a street/strip application incase it matters.

 

not sure if this helps, but I just swapped a 350 from my 305, and I had to get a flywheel for it.
the auto flywheels don't weigh that much, and from the way it looks is it only needs to hold in the torque converter and start the car.

 

Thanks. Anyone else?

 

Will someone please explain this to me?

 

Light weight one will spin faster and uses up less horse power to spin(les rotating mass).

Stock one or one that weights more will help out more on the launch.

 

Why will it help out more on the launch?

 

more momentum most likely, just the physics behind it, something spinning wants to keep going.