If you put a balanced assembly(pistons,rods, crank) into your LT1 or LS1 , is
the stock flexplate ok to reuse? I know that the harmonic balancer/damper is neutrally balanced, but is the flex plate? If not, should it be neutrally balanced apart from the rotating assembly as the balancer/damper is?

 

Yes, it is neutrally balanced. Shouldn't need to have it balanced..

Dan

 

What about the little weight on the flywheel? If it is neutrally balanced, why is this weight on it?

 

Are we talking flex plate of flywheel? Flywheels need to balanced with the clutch/pressureplate assembly. Flex plates come neutrally balanced and only weigh a couple pounds unlike a flywheel.

Dan

 

Like said above..

Flexplate (automatic car) or Flywheel (manual)?

 

John, the factory flexplate is 0 balance and will interchange with all engines of that type. Aftermarket flexplates are close but not perfect in balance and you must balance with the engine for over 6000 rpm use!

 

Yeah, problem is the original post talks about a flexplate, then in a follow up post he says flywheel. Just trying to figure out which one he's asking about.

 

Whoops, sorry for the misspell there. It is a flex plate (auto tranny) I am writing about. If it is neutrally balanced from the factory, why is there a small weight
tacked/welded onto it?

 

I have been thinking about the TCI Flexplate but, not sure if $200 is money well spent. My stock flexplate looks fine and I will be spinning the motor to 6,600 rpm.

 

The balance process, add weight or drill holes as needed to make up for any runout or welding differances and even metal thickness problems from stamping.

 

My factory flexplate was balanced by itself. They drilled one 5/16" hole.

 

If your vehicle is a 98 thru 00, you have the better flexplate anyway, it was the 01 & 02 models that had the problem with the flexplates cracking.

I have an 01 Z28, and changed the flexplate to a TCI SF29 unit when I upgraded the TC.

SteveC