I bought this stand as it is rated for 1250 lbs. Bought the 454 for the brackets and then to reseal it and sell it. Is this much sag normal? The engine can't be rotated as there is too much weight. I did re-center the engine in the brackets but didn't help any. I have another 454 which has been rebuilt and needs to be finished. I am scared to put it on the other stand I bought.