2006 dura cross v8 pennies in a can noise
 

hello.. My 2006 raider dura cross v8 [148.000] has a sound like " pennies in a can / playing card in a bike spoke ?} in or under right side of engine { side where battery is } can not hear it in the cab only under hood or under truck, just replace 600.00 worth of parts, but my guy said he has never heard those sounds before had a friend come over and those are the sounds each heard { both mechanics for over 20 plus years } has any one had or heard of this ??? I bought this in Nov 2005 right off the ramp, so I know everything that has been done to or repaired