Not Ranked
There are no problems with the stock 5.0 crank or block up to 400 fwhp. the only time you run into problems is with power adders and poor tune. the standard 5.0 rotating assembly from 86 thru 92 is very durable. I have a stock 86 motor in my mustang that has 300000 mile on it. I seen motors sprayed at 150hp level on a conservative tune last for several years. You can break the block with boost or spray but I would think that you would be hard pressed to destroy one naturally aspirated.
later
dennis
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