Balanced flexplate

[Nacho-RT74]

what would it be the propper balanced flexplate for cast crank to eliminate the welded weights at converter ?

400 if makes some diff beside any other BB

[John_Kunkel]

The B&M #10237 works on all cast crank big blocks.

[Nacho-RT74]

I found that PN but I'm a little bit confused. Info is not vey detailed... will that flexplate allow me to remove the weights and/or install neutrally balanced converters on my cast crank stock assembly ?

[A383Wing]

Yea..I think so....If I remember correctly, the flex plate has one of the "sides" missing for use on a cast crank

[Nacho-RT74]

Yes I have seen them but was thinking on that it was for clearence to the counterweights... the problem is when manufacturers/sellers provides generic info and not produc specific info

[Nacho-RT74]

what would you preffer on to a cast crank with neutral converter... a balanced flexplate or a propper crank dampener for that ? ( fluid or whatever option available )

[A383Wing]

You got a couple of choices....

Cast crank with matching harmonic balancer and balanced flexplate.
cast crank with matching harmonic balancer and weighted torque converter

Not sure what else you can do....if you don't run the counter-weights for the crank, you are gonna get a vibration

[Nacho-RT74]

yeah I'm searching for use neutral converters with cast crank. I hate the welding procedure because it could be a non reversible one. Preffer a bolt on option.

Also hate go with a counterweight set to just use a pair of them and eat the rest  ... beside go to a shop to weld.

I'm also thinking on that because if I can find a forged 383 crank maybe I will change mine. I can get back the stock flexplate and will use the harmonic balancer coming with the forged crank.

I already did the counterweight weld job once, but don't want anymore. In fact I would like to remove the weights.

Balanced flexplate or harmonic balance... dunno

Harmonic balance deal will need to consider also the pulley maybe ? I know some years got diff bolts set up and offset.

[A383Wing]

Both the Harmonic balancer and balanced flexplate are needed to mate to cast crank...you can use just one or the other from what I have heard.

Yea...your other option would be to switch to balanced crank....and then you will have to find crank pulley to match

[Cooter]

You CAN have a cast crank welded with "Mallory" metal in order to FORCE it to neutral balance like a steel crank, but it's expensive...

I've torn down 440's cast crank engines, or what I THOUGHT was a cast crank engine due to the balancer only to find out Chrysler rebalanced a steel crank engine to Force it to external balance....Loads of Mallory metal plugs in the crank....Possibly a Warranty engine...

[Nacho-RT74]

and what about this ?
http://cgi.ebay.com/ebaymotors/MOPAR-BALANCE-PLATE-TORQUE-CONVERTER-FLEXPLATE-440-383_W0QQitemZ220513154965QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item33579bb795

first time I see this but is something I was thinking will be nice

[A383Wing]

Yea...that's the one I was thinking about...but the ones I saw had more "meat" on the flexplate, (probably for the smaller engines I would guess)....you will still need to use your OE harmonic balancer with the cast crank also

[John_Kunkel]

The concept behind the B&M style flexplate with the missing notch is to remove the amount of weight (the notch) from the side of the flexplate 180° opposite where the weight would be positioned on the converter.

The ebay offering is poorly designed, the oblong weight won't fit between the crank flange and the flexplate because the flexplate is dished forward, placing it between the flexplate and the converter will require spacers of the same thickness under the drive lugs and either setup risks shoving the converter into the pump and causing a starter/ring gear mismatch. Bad, bad idea.

[Nacho-RT74]

The concept behind the B&M style flexplate with the missing notch is to remove the amount of weight (the notch) from the side of the flexplate 180° opposite where the weight would be positioned on the converter.

yes I thought that after post the question about

The ebay offering is poorly designed, the oblong weight won't fit between the crank flange and the flexplate because the flexplate is dished forward, placing it between the flexplate and the converter will require spacers of the same thickness under the drive lugs and either setup risks shoving the converter into the pump and causing a starter/ring gear mismatch. Bad, bad idea.

yes though on that... and also the center converter hub will be out of the crank location for it ( depending of thickness )

Initially not really a bad idea, but need to think more on what is affecting to get a better design

[firefighter3931]

The B&M #10237 works on all cast crank big blocks.

That is the only real choice you have when using a neutral balance converter with a cast crank engine. 

The ebay offering is poorly designed, the oblong weight won't fit between the crank flange and the flexplate because the flexplate is dished forward, placing it between the flexplate and the converter will require spacers of the same thickness under the drive lugs and either setup risks shoving the converter into the pump and causing a starter/ring gear mismatch. Bad, bad idea.

100%....That e-bay gimmick is a joke. I wouldn't run that setup on a lawnmower, letalone a car that i expected to stay together for any length of time. 

Buy the right part for the job in the first place and be done with it. 



Ron

[Nacho-RT74]

[Nacho-RT74]

got the answer about the thickness of the plate:

Those are .107" thick.