<BLOCKQUOTE>quote:</font><HR>Originally posted by pdq67:
A neutral balanced flywheel or flexplate means that it isn't balanced out of balance or what is called "Detroit-balanced" like the 400SB and 454BB that are both "externally-balanced" engines.
These engines needed more weight to balance them so Detroit put some of the extra needed weight outside the engine at the ends on the flywheel or flexplate and balancer.
All other engines are balanced internally so the balancer and flywheel/flexplate are neutral balanced.
Plus, they aren't balanced for a specific engine so can be used on any engine that can use them.
The other two, (400&454 type), can only be used on their specific engines, but can be used on all of them since they are for them.
Does this make since???
A 400 balancer has a cut off the outer circumference of it as well as a big bump of metal on the flywheel and a plate on the flexplate. The 454 style has the bump of metal on the balancer, but on the inside of it's backside. Plus, has about the same bump and plate on the flywheel and flexplate only both different weights then the 400 has! pdq67
Thank you, this cleared up alot. Joe