Join Date: Dec 2000
Location: Monroe, WA, USA
torque converter's are balanced when built, and to a great extent are self balancing, they are fluid filled. it is impossable to balance a rotating assembly with a torque converter on it, as once filled with fluid it will be self balanceing.
normaly you get a roataing assembly balanced with the harmonic balancer and flywheel/flex plate. if all the part's are static balanced and are in spec's a dynamic balance is not nessary if the motor will not see abouve 6 grand very much you probably do not need a dynamic balance.
when GM build's new motor's all the part's weight with in a certain spec, they do not get balanced. for year's a lot of rebuilder's just made sure the piston and rob's weight was ok and that was it.
are your motor mount's good? trany mount? all so check the flex plate/fly wheel mounting bolt's and clutch/torque converter bolt's. oh and the tranny bellhousing bolt's.
if you want to repalce the harmonic balancer get anthor 8" one with apropiate timing mark on it. it will work. IMHO i feel the largest harmonic balancer you can run is better. david vizard is of the same mind as me on this, so are some other pro engine builder's. there is all so a group that say use the smallest you can. so i guess it is what you think in the end. me i would stay with a 8", most 350's use a 8" balancer when new from GM.
if you have a externaly balanced motor, like a 400SB or a most 383SB you use a biferant flex plate/flywheel and harmonic balancer then other SB's.