[cableguy0]

Things can resonate through the engine. If the distributor has a bunch of play or a loose gears it can knock and will carry right through the engine. you need to locate the source of the knock. get a long screwdriver or a piece of heater hose and listen to the engine to find where the noise is loudest and at least you will have a general area to look in. Most of the parts in the engine can create a knocking noise under the right conditions. Just so im straight the engine was quiet before? You replaced the distributor and the knock started? Obviously you wanna go for the part that was changed first as the source. Most parts guys are selling parts because they cant hack it spinning wrenches. Most of the advice that comes from behind the counter should definately be taken with a grain of salt. The water pump,balancer, power steering pump can all knock as well. A Loose timing chain will also cause a knock. Loose wrist pin,broken piston skirt. cracked piston,rod& main bearings. flexplate/torque converter.