I had a short block built that was balanced with a stock crank. If I were to put another stock crank in it with the same rods and pistons, do I need to have it rebalanced? Or are stock cranks usually pretty close to one another?

 

Just curious as well...

 

When you balance a rotating assembly you weight match the rods and pistons and balance the crank to those items. If the shop that done the work keep good records they will have it documented of how much weight your stuff was and they will be able to spin your new crank and see if its need or not.

 

Id just rather pay to have it rebalanced somewhere else than go back to the shop that built it last time.

 

Just bring it all in and have the assm. balanced you can allways improve on the factory balance jobs although the ls-1's are balanced closer than the older sbc's

 

It all depends how the shop balanced the motor, the one I use, they balance all the part individually and then assemble and balance the entire thing, to make sure crank is right.

The reason they do this, is now you can swap pistons or rods and just have them rebalanced, not the entire rotating assembly

ed

 

If your engine was built for you using the stock components then another crank that's stock should be fine. If your engine was built with different pistons/pins etc they may weigh more or less then stock. If they are a different weight then your crank should be rebalanced to suit. Ls1 stock parts are very evenly weight matched imho