As soon as the engine turns over, the blades will flex in the proper position.<br /><br />However, the proper way to install the impeller is to have the housing in your left hand, then with your right hand spin the impeller into it in a counter clockwise direction.
Hello ,,,I just replace my impeller and was instructed by a pro to lightly grease the impeller,rotate the shaft in a clockwise manor while putting pressure on the housing,, it should slide right on,, mine did