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Don't bother

While balancing the crank they grind and taper the counterweights so they are thin on the very outermost edge (like a "knife" with the back to the center and blade to the outside edge). This reduces the total weight of the shaft (spinning HP) and reduces the "froth" of oil bath in which it sits. Not required unless you are trying to get every ounce of HP and running extreemly higher RPMs (like over 10K).

It is being done on some of the ultimate Honda machines running the quarter. You can see some examples in Turbo Magazine if desired.
 

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Knife edging your crank will also make it lighter which will reduce internal stresses and the engine will rev alot faster.

The crank will also "slice" thru the air in the cranckcase with less turbulance.

This is done prior to balancing the engines rotating components.

Almost every race engine will have this work do to it if the builder is serious about performance.

This is done to my engine in my dragster and it does not turn over 8000 RPM. Big Block Chevy, almost 500 cubes.
 

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Downsides-

If not done properly it will weaken the crank.
You must always balance the rotating assy. after any work like this or changing pistons rods etc.

Cost-
It all depends on who is doing it. I would find a shop that only does RACE engines, not some guy doing engines in street cars such as all the so- called Hunda "Tuners". And then ask them if they do the work inhouse or where they send it to be completed.

Remember that is will cost you alot more later if you skimp now.
 

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Big Kid
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I had it done and didnt notice any improvement. I might see some change on a dyno but who knows
 
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