Are girdles generally added for big rpm or HP or torque

pittsburghracer said

If it makes you sleep better at night buy one and use it. I sleep fine so I never wasted my money on one.

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X2. If you REALLY need a girdle, you really need a better block. It protects the block - not the crank. The block is the weak point. But well executed, the block will last just fine at the power levels most guys can build to.