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I'm doing a complete engine rebuild bottom and top end and installing stage1 hotcam what's the best way to break in the motor
400ex rebuild
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A sledge hammer will do a fine job of breaking the motor 
Seriously - a 2lb polycast deadblow is what I use. After the bottom is stripped and ALL the bolts are removed from the engine case, I alternately hit the crankshaft and countershaft to separate the cases. Then put the RH side of the engine on a couple of 4x4 blocks of wood and lift the LH side off (alternately tapping the crankshaft and countershaft) to get the case off and leave all the transmission parts, crankshaft and balancer shaft in the RH half.
Seriously - a 2lb polycast deadblow is what I use. After the bottom is stripped and ALL the bolts are removed from the engine case, I alternately hit the crankshaft and countershaft to separate the cases. Then put the RH side of the engine on a couple of 4x4 blocks of wood and lift the LH side off (alternately tapping the crankshaft and countershaft) to get the case off and leave all the transmission parts, crankshaft and balancer shaft in the RH half.
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