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The issue is the torque converter, small engines have relatively high stall speeds (lots of slippage at low engine RPMs, to compensate for a relative lack of low RPM torque) while V-8s generally have much lower stall speeds (to better utilize the low RPM torque they produce). So with the higher stall speed converters popping it back into gear with the engine idling doesn't load the drive-train due to the high slippage, the low stall speed converter imposes a significant load on the drive-train even at idle hence the fun noises.
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