Just plug your pump into the block, with tubing. Turn the pump on and let it flow/bleed. Now close off the outlet hose totally through whatever means. You are now experiencing the most pressure that your pump will ever provide to the block. Under regular operation the block will probably be receiving half the pressure that doing the above will cause. If the block doesn't leak, then it's safe enough to use for normal operation, since normal operation pressures are lower.
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