Ron starts this episode with a call on a 91 Bronco that, when hot, will give a clunk and a whirr when starting : answers an email on removing spark plugs on an old vehicle where the plugs are about 20 years old : an answers another email regarding parts for a small block chevy and buying original parts yet nothing in the boxes was stamped as genuine GM : and Ron talks with Randy Zahorchak, Product Manager, and Chris Gillespie, Director of Category Management of Dorman Products about exhaust manifolds.