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I have an older Ford Bronco with a brand new 351W. I make a squeaking noise when revving up the engine and coming down. It doesn't make the past 2,500 rpm. It also doesn't make the noise when I accel. slow. I brought it to a shop and they said a bent pushrod. After getting it home I pulled the pushrods nothing. The shop refunded my money the next day. I have ran the engine with out the belts still the problem stay.